You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to some personal issue. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Ok, I am Gary Thompson.

ASSISTANT: Thank you, please wait for a moment.

USER: Sure.

ASSISTANT: No reservation found on your name in my database.

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.