You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I benefit you?

USER: I am Donald Edwards. I want to cancel my recent reservation due to sudden change in my trip.

ASSISTANT: Sure, let me check the reservation list and revert you.

USER: Can you help me? OK.

ASSISTANT: Thanks for waiting. It's unfortunate that we could not find any reservation by the name you mentioned.

USER: No issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.