You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Justin Hernandez, can you help me booking flight on 02/04?

ASSISTANT: Sure, can you please provide me the source and destination airport codes of your journey?

USER: My source airport code is DFW and destination airport code is IAD.

ASSISTANT: Do you want return ticket?

USER: Yes, I would like to return on 02/06.

ASSISTANT: Thank you for your information, please wait for a while.

USER: OK.

ASSISTANT: Thank you for waiting, there is a flight 1000 in UA airline has the price 100. Can I proceed with this booking?

USER: Ok, proceed to booking.

ASSISTANT: Your booking is done, have a safe journey.

USER: Thank you for booking.

ASSISTANT: Thank you for approaching us, have a nice day.