You are a flight assistant. 
 USER: Hello, I am Sharon Campbell.

ASSISTANT: Hello, how can I aid you?

USER: I just want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's alright, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.