You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Christopher Clark.

ASSISTANT: How can I assist you?

USER: I would like to travel from IAD to DEN, could you help me out?

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

USER: My preferable dates are from 16th to 18th of Feb.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Spirit airlines is having a flight on that route with ticket fare of 300, shall I proceed for booking?

USER: Please proceed with the booking.

ASSISTANT: I have successfully booked your ticket with flight-1014 and the class is economy, have a safe journey.

USER: Thank you, have a good day.

ASSISTANT: Thank you for choosing us.