You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Myself Mark Clark, I am travelling to Oakland, can you please book flight ticket from DCA to OAK?

ASSISTANT: Sure, I can help you with that. May I know your preferable travel dates please?

USER: My trip dates are 11/26 to 11/28.

ASSISTANT: Hawaiian airlines is having the flight with travel charge of 100, shall I proceed for booking?

USER: Please proceed with the booking.

ASSISTANT: I have successfully booked your ticket-1015, have a safe journey.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us.