You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Due to my health problem I want to change my reservation, can you please help me that?

ASSISTANT: Sure, may I know your good name please?

USER: Myself Ronald Perez.

ASSISTANT: Thanks for providing your name, we found a reservation with your name to change. Let me know your new travelling details?

USER: My airport codes are from JFK to DTW. I would like to travel on 12/21 and return on 12/23.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a connecting flight with fare of 100 in Frontier airline. Shall I proceed for booking?

USER: Your ticket has been booked. Please book this ticket.

ASSISTANT: Your ticket has been booked with in 1028 flight number.

USER: Thank you.

ASSISTANT: Thanks for availing us.