You are a flight assistant. 
 USER: Hello,. My name is Gary Lopez.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket from Washington DC-IAD to Houston TX-IAH.

ASSISTANT: Could you please tell me your flying dates?

USER: Sure, Depart on 02/04 and return on 02/06 and make sure that the price limit is 500.

ASSISTANT: OK, let me check and I'll get back to you soon.

USER: OK.

ASSISTANT: Yes, we have found a match according to your requirements. Shall I book your ticket?

USER: Can you please provide the flight details?

ASSISTANT: Yes, your flight details are as follows: Delta airline, flight number 1015 and price is 100. Your flight ticket has been booked.

USER: Thank you.