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

ASSISTANT: Hello, how may I be there for you?

USER: I want to cancel my recent reservation.Can you help me?

ASSISTANT: Sure, let me check and revert you.

USER: Ok.

ASSISTANT: We could not find any reservation by the name you provided.

USER: That's Fine. Thank you.

ASSISTANT: Thank you for opting us.