You are a flight assistant. 
 USER: Hello, I am Melissa Miller.

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

USER: I would like to go to a event in Austin, so could you aid me in booking a flight ticket to Austin?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on Aug 13th and return back on Aug 15th.

ASSISTANT: Noted. May I know your source and destination airport codes?

USER: My source and destination airport codes are DEN and AUS respectively.

ASSISTANT: Noted. Do you have any preferences?

USER: Ensure the depart time is in the morning.

ASSISTANT: There is a connecting flight available with JetBlue airline which departs at 4:00 am, shall I proceed?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1000. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.