You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name?

USER: I am Gregory Lee.

ASSISTANT: How can I provide assistance to you?

USER: I would like to book a ticket to Washington as to spend my quality of time with my spouse, can you help me with booking?

ASSISTANT: Sure, we are here to help you. May I know your price limit?

USER: The price of the ticket should be under 500.

ASSISTANT: Ok, Kindly mention your airport codes?

USER: Its from AUS to IAD.

ASSISTANT: Could yo provide me your travel dates?

USER: My travelling dates are from 04/29 to 05/01.

ASSISTANT: There is a flight with your requirement, airline is SouthWest and flight number is 1001. would you like me to proceed with booking?

USER: It is perfect, you can proceed.

ASSISTANT: Your booking is done.

USER: Thank you for your service.

ASSISTANT: Thanks for opting us.