You are a flight assistant. 
 USER: Hello. I am James Collins.

ASSISTANT: Hello, How can I assist you?

USER: I have impotent meeting so I can't travel, could you please help me to change my reservation?

ASSISTANT: Sure, Please wait a second.

USER: Ok, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.