You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Jason Perez. I need to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry  Jason Perez, there is no active reservation on your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.