You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Dennis Phillips here, I want to cancel my reservation as my plan to go for trekking got cancelled. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok fine, thanks for your assistance.

ASSISTANT: Thank you for choosing us.