You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Patrick Davis. As my plan to go for shopping has been postponed, can you please cancel my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: According to your name, there is no reservation found under your name to cancel it.

USER: Ok. Thank you.

ASSISTANT: Welcome.