You are a flight assistant. 
 USER: hello.

ASSISTANT: Hello, how may I address you?

USER: I need to cancel my ticket due to sudden change in my plan.

ASSISTANT: Ok, Will you please forward you name?

USER: Dorothy Johnson here.

ASSISTANT: Ok, let me check the status of the reservation made formerly and revert you.

USER: sure, take your time.

ASSISTANT: Thanks for waiting, I have through the list twice but could not find any reservation active by your name.

USER: Not a problem, Thank you for helping me.

ASSISTANT: Thank you for choosing us.