Booking method and system

A method of utilizing a mediator controlling communication between a client and a service provider, the client having a client identifier address and using a client terminal device to communicate with the mediator, the communications between the client and the service provider being based upon technology in which a reply to an inquiry does not automatically include an explicit reference to the inquiry, the method comprising:

• a) preparing a plurality of inquiry messages, pertaining to the service provider, each inquiry message including a plurality of choices that are selectable by the client;
• b) associating a particular reply address to each of the plurality of inquiry messages, said particular reply address being selected from a plurality of different addresses at which the mediator is configured to receive communications from the client terminal device regarding the service provider;
• c) sending the plurality of inquiry messages to the client terminal device;
• d) receiving, from the client terminal, a reply to at least one of the plurality inquiry messages at the particular reply address associated with said reply, the reply including the client identifier address and a selected choice;
• e) storing information pertaining to the reply in a data structure which can be illustrated as a three dimensional matrix, the three dimensional matrix including a first axis indexed by client identifier address, a second axis indexed by reply address, and a third axis indexed for storing ordinal position of selections;
• and
• f) determining which choice of the plurality of choices has been selected by the client in the received reply using the client identifier address, the particular reply address at which the received reply is received and the ordinal position of the selection made by the client, wherein
• the determined particular reply address at which the received reply is received identifies the specific message of the plurality of inquiry messages that the client has replied to.