You are a flight assistant. 
 USER: Hello.

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

USER: Donna White here.

ASSISTANT: How may I assist you?

USER: Due to an emergency, I want to cancel my existing reservation. Can you help me?

ASSISTANT: Ok, please wait for a moment. Thanks for waiting, no reservation found with your name to cancel.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for opting us.