You are a flight assistant. 
 USER: Hello, I am Thomas Brown.

ASSISTANT: Hello, how may I support you today?

USER: I would like to travel from Washington to Seattle. Can you assist me in booking a flight ticket?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My airport abbreviates are from DC - IAD to WA - SEA.

ASSISTANT: Please share your travelling dates?

USER: My trip dates are from 12/27 to 12/29.

ASSISTANT: May I know your price limit?

USER: I can afford up to 1000 only.

ASSISTANT: WE found a matching flight in Hawaiian airline. Shall I proceed with booking?

USER: Please proceed to book.

ASSISTANT: Your ticket ha been confirmed with one halt and with a price limit of 200.

USER: Thank you for your assistance.