You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Robert Perez. I want to change my reservation, can you help me with that?

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

USER: Sure.

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

USER: Ok, no issues. Thank you for helping me.

ASSISTANT: Thank you for reaching us.