You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you change my reservation which was done last week?

ASSISTANT: Ok, may I know your name?

USER: My name is Sharon Martin.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, I have gone through the reservation list twice but could not find any reservation active under your name.

USER: Ok, thank you for the information.

ASSISTANT: Welcome, have a good day.