You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, I just want to cancel my recent reservation. Can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: Donald Green.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found with your name in our records.

USER: Ok, thank you.

ASSISTANT: Most welcome.