You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am William Anderson. I would like to travel from IAH to DFW. Can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates will be on 04/18 to 04/20.

ASSISTANT: How much you can afford for this ticket?

USER: I can spend 200.

ASSISTANT: We found a flight on your details with airline UA, flight number: 1004. Shall I book this ticket?

USER: You can proceed to booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.