You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you help me to change the recent reservation which I had done to visit the art gallery in Las Vegas?

ASSISTANT: Sure, I am glad to help you. Can you please share your good name with us?

USER: Ok, please check for the name Larry Roberts.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our database.

USER: Ok, that is not a issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.