You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I am Karen Smith, want to cancel my reservation due to some personal issues. Please help me.

ASSISTANT: Sure, please wait a minute.

USER: Sure.

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

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.