You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?

ASSISTANT: Sure, I am here to help you. May I know your name to proceed?

USER: Myself Margaret Lopez.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: We regret to say that, we have not found any reservation on your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.