You are a flight assistant. 
 USER: Hi. I am Jessica Walker.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I want to cancel my recent ticket booking due to office work that my manager did not approve my leaves, so can you please cancel it?

ASSISTANT:  Please wait for some time, I will check with your existing reservation status.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us with a query.