You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please change my active reservation as my meeting was postponed.

ASSISTANT: May I know your name?

USER: Myself Justin Miller.

ASSISTANT: Please share your airport codes.

USER: I would like to fly from PHX to JFK.

ASSISTANT: Can I know your travelling dates?

USER: I have planned to travel on Mar 23rd and return on 25th.

ASSISTANT: Do you need any connection limit?

USER: I like direct flight.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: There are no flights available on your routes.

USER: Ok, not an issues. Any way thank you.

ASSISTANT: Thank you for choosing us.