You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Green.

ASSISTANT: How can I assist you today?

USER: Could you help me in booking a flight ticket from PA - PHL to CO - DEN?

ASSISTANT: Sure, I'm glad to help you in that. May I know your planned travel dates please?

USER: My departure day is Dec 20, return day is Dec 22.

ASSISTANT: Ok, please let me know if you have any other specifications.

USER: I need a connecting flight.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Spirit airlines is providing a flight on that route with ticket fare of 100, shall I proceed for booking the ticket?

USER: You can proceed to booking.

ASSISTANT: I have successfully booked your ticket with flight-1016, have a safe journey.

USER: Thank you.

ASSISTANT: Thank you for choosing us.