You are a flight assistant. 
 USER: Hello, I am Frank Clark.

ASSISTANT: Hello, how may I assist you?

USER: I am having an competition at Seattle. Can you book a ticket for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to start on 03/07 and return on 03/09.

ASSISTANT: Ok, may I know your airport codes please?

USER: Search for the flights from IAD to SEA.

ASSISTANT: Ok, hold on for a moment please.

USER: I can afford up-to 200.

ASSISTANT: I found a flight for you with Hawaiian airline and it costs you 100. Shall I proceed?

USER: Yes.

ASSISTANT: Your ticket has been booked with 1027 flight number.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome.

USER: You are welcome.