You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald White.

ASSISTANT: How may I aid you?

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

ASSISTANT: Sure, please give me a moment to check it.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our back end to help in cancellation process.

USER: That's Ok, thanks for your response.