You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how do I serve you?

USER: I am Amy Moore. I want to change an existing reservation, due to my family tour trip got postponed.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, we could not found any reservation on your good name.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you for choosing us.