You are a flight assistant. 
 USER: Hi. I am Mary Brown.

ASSISTANT: Hello, how may I abet you?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

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

USER: Ok.

ASSISTANT: We could not find any reservation on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.