You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, Frank Anderson here.

ASSISTANT: Give me a moment.

USER: Sure, take your own time.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: Oh! That's ok, thank you anyways.

ASSISTANT: Thank you for reaching us.