You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Rebecca Walker here. Can you please help me in booking a flight ticket from OAK to IAD?

ASSISTANT: Sure Rebecca Walker, I will help you with that.  Can I have your travel dates please?

USER: Sure, my travel dates are from 05/27 to 05/29.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Ok, take your time.

ASSISTANT: UA airlines running a flight in your route with connection 1 and the ticket fare is 200. Shall I proceed with booking?

USER: Ok, please proceed with booking.

ASSISTANT: Ok Rebecca Walker, your ticket booking has done and the flight number is 1002.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us, have a great journey.