You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Debra Thomas, want to cancel my recent reservation because of some personal issue. Please help me out with that.

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure, but make it fast.

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

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

ASSISTANT: Most welcome.