You are a flight assistant. 
 USER: Hello, I am Robert Taylor.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from SEA to OAK?

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

USER: I am planning to start on 04/16 and return back on 04/18.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: I found a flight for you with UA airline and it costs you 100.

USER: Yes, please book it.

ASSISTANT: Your ticket has been booked with 1005 flight number.

USER: Thank you for booking.

ASSISTANT: Welcome. Thank you for choosing us.