You are a flight assistant. 
 USER: Hello. I am Mark Hernandez.

ASSISTANT: Hello, how may I assist you at  this moment?

USER: I need to book a ticket from IAH to PHL, can you help me in doing that?

ASSISTANT: Sure, May I know on which dates you wish to travel?

USER: My travelling dates are Mar 21 to Mar 23.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: May I know your price limit please?

USER: I can pay you 200.

ASSISTANT: We found a AA airlines, flight number 1009 with connecting flight in economy class, and the fare of 100.

USER: Ok, please proceed with booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.