You are a flight assistant. 
 USER: Hello.

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

USER: I would like to change my existing reservation. Please help me out.

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

USER: Sure, take your time.

ASSISTANT: May I know your name?

USER: My name is Christine Rodriguez.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.