You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Taylor.

ASSISTANT: How may I help you?

USER: I am planning to change an existing reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please be on a hold for a while.

USER: Sure.

ASSISTANT: I found reservation on your name, may I know your new airport codes please?

USER: My airport codes are DEN to PHL.

ASSISTANT: Sure, could you please share your trip dates?

USER: I would like to travel on 11/22 and return back on 11/24.

ASSISTANT: Here, there is a connected flight. Can I proceed?

USER: That's fine, please proceed the booking.

ASSISTANT: Ok, your ticket is booked with Frontier airlines and flight number 1022.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.