You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you now?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I am here to help you with that. For changing your reservation, we need to know your name. So, please forward me your name.

USER: Myself Patrick Garcia.

ASSISTANT: Please, wait for a while.

USER: Ok.

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

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.