You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Gregory Adams here. I need to attend a workshop at San Francisco, can you please help me in booking a flight ticket from DCA to SFO?

ASSISTANT: Sure, I will help you. Please let me know your trip dates.

USER: Sure, my travelling dates are from 05/28 to 05/30.

ASSISTANT: Ok, please be on hold for a while.

USER: Ok, take your time.

ASSISTANT: There is a flight available with Frontier airlines and the ticket fare is 200 only. Shall I book the ticket for you?

USER: Ok, please proceed with booking.

ASSISTANT: Adams, your ticket is booked and your flight number is 1000.

USER: Thank you for your service.

ASSISTANT: You are most welcome and have a nice day.