You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Gregory Rodriguez. I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, I am here to help you out with that. Please give me a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation with your name in our records.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for reaching us.