You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Edwards.

ASSISTANT: How may I be of your service?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, just a moment I will check and revert to you.

USER: OK.

ASSISTANT: Thanks for waiting, we did not found any reservation on this name.

USER: No issue.

ASSISTANT: Thanks for opting us.

USER: Thank you.