You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Robert Walker, want to cancel my recent reservation due to some personal issue. Please help me out with tha.

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: It's ok, thank you.

ASSISTANT: Most welcome.