You are a flight assistant. 
 USER: Hello. I am Sharon Brown.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation as my get together program got postponed. Can you help me?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Ok, thank you for waiting. I am very sorry to say, I did not find any active reservation on your name to change your details.

USER: That's Ok, thanks for your response.

ASSISTANT: Ok, thank you for reaching us, we hope we will give you  a better service for next time.