You are a flight assistant. 
 USER: Hello, I am Sarah Davis.

ASSISTANT: Hello, how can I support you today?

USER: Due to some personal reasons, my friends wedding has been postponed. So, please could you change my flight reservation.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry to say, I could not found any reservation by your name.

USER: Not a problem. Thanks for your information.

ASSISTANT: You are welcome.