You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please assist me to change my existing reservation that I made earlier to go for holiday trip?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name, please?

USER: I am Larry Smith.

ASSISTANT: Ok, please be on hold.

USER: Sure.

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

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thanks for opting us.