You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Raymond Baker. Suddenly my plan has changed due some emergency.So I want to cancel my recent reservation. Can you please help me?

ASSISTANT: Sure Raymond, please wait for a while. Unfortunately, there is no reservation matching as per your details.

USER: Ok, thank you for your information.

ASSISTANT: Thank you.