You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please.

USER: Margaret Campbell is my name.

ASSISTANT: How may I help you today?

USER: Due to emergency health problem I want to cancel my recent reservation. Can you help me?

ASSISTANT: Sure, I can help you. Please wait a moment, I will check and revert you.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation on your name to cancel.

USER: Ok, no issue.

ASSISTANT: Thanks for picking us.

USER: Thanks for your assistance.