You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Frank Garcia. I want to change my existing reservation, can you help me?

ASSISTANT: Sure, I am gleeful to help you out. Please allow me a moment to check the reservation details.

USER: Sure.

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

USER: No issues. Thank you.

ASSISTANT: Thank you for reaching us.