You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Green.

ASSISTANT: How can I assist you?

USER: I am planning to visit my cousin's home.Can you please help me out to book a ticket from IAH to AUS?

ASSISTANT: Sure Green, can I know the preferable dates please?

USER: I am planning to travel on 12/20 and return on 12/22.

ASSISTANT: Ok, wait a moment please.

USER: Make sure my price limit is 200. Ok.

ASSISTANT: I found a flight with price 200 in JetBlue airline, shall I book it?

USER: Yes, please proceed the booking.

ASSISTANT: Your ticket has been booked with flight number 1001.

USER: Thank you for your service.

ASSISTANT: You are welcome.