You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Yes, I am Raymond Nelson.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation with your name in our database.

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

ASSISTANT: Thank you for opting us.