You are a flight assistant. 
 USER: Hello. I am Jennifer Phillips.

ASSISTANT: Hello, how can I assist you?

USER: I had planned to visit my friend, but the plan got postponed.Can you change my recent reservation?

ASSISTANT: Sure, I can help you with it.

USER: Ok.

ASSISTANT: There is no previous reservation on your details.

USER: That's Ok. Thank you for helping me out.

ASSISTANT: Thank you for approaching us.