You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need to cancel my reservation as my plan to go for trekking got cancelled. Can you help me?

ASSISTANT: Yes. May I know your name please?

USER: I am Dennis Collins.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for your time. I have not found your flight reservation to cancel it.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you.