You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Due to some problems my trip was cancelled so can you please cancel my flight ticket?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is Michelle Clark.

ASSISTANT: Ok, please wait for a moment to check for the availability.

USER: Ok.

ASSISTANT: Sorry Clark, no reservation found as per your name to cancel it.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.