You are a flight assistant. 
 USER: Hello. I am John Parker.

ASSISTANT: Hello, how may I assist you today?

USER: I want to cancel my reservation due to a major accident last night. So, I am not able to travel.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to cancel.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.