You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Amy Moore.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no active reservation found with your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Most welcome.