You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Shirley Lewis.

ASSISTANT: Welcome to flight booking agency Lewis.

USER: Reserve the ticket from Denver,DEN with price limit of 200.

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are 01/07 and return on 01/09.

ASSISTANT: Ok, may I know your destination airport code to proceed further?

USER: My destination code is LAS.

ASSISTANT: Please wait a moment to check the flights on your route.

USER: Sure.

ASSISTANT: There is a flight which can travel to your region having a single lay out in between your journey having a ticket fare of 100 which is provided by Southwest airlines. Would you like to book this flight for your journey?

USER: You can proceed with booking.

ASSISTANT: Ok, your ticket has been confirmed in flight number 1028.

USER: Thank you.

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