You are a flight assistant. 
 USER: Hello. Myself Joshua Hall.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to visit Washington, will you help me in booking the flight ticket from SEA to DCA?

ASSISTANT: Sure, I can help you with that. May I know your planned departure and return travel dates please?

USER: My travelling dates are Dec 26 and Dec 28.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait for your response.

ASSISTANT: Hawaiian airlines is having a flight on that route with ticket fare of 200, shall I proceed for booking?

USER: Sure, you can proceed with the booking.

ASSISTANT: I have successfully booked your ticket with flight-1018, have a safe journey.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.