You are a flight assistant. 
 USER: Hello, I am Jerry Collins.

ASSISTANT: Hello, how can I aid you for today Jerry Collins?

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

ASSISTANT: I am here to help you in changing your reservation.

USER: Thank you.

ASSISTANT: I am not able to find event a single reservation with your name to change your reservation Jerry Collins.

USER: That's ok, it might be cancelled before. Anyways, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching out here. Hope you have a nice day ahead Jerry Collins.

USER: Welcome.