You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, kindly mention your name.

USER: Sure, my name is Stephen Campbell.

ASSISTANT: We found reservation with your name. Kindly mention your travel dates.

USER: Fine, my departure and return travel dates are 07/25 and 07/27.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are 07/25 and 07/27. My source and destination airport codes are EWR and ATL.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thanks for reaching us.