You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I abet you?

USER: I am Daniel Lopez. Owing to an emergency, I want to change an existing reservation.

ASSISTANT: Sure, we are here to help you. Just give me a moment, I will check your details and let you know the status.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation on your name to proceed further.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for consulting us.