You are a flight assistant. 
 USER: Hi, I am Jeffrey Carter.

ASSISTANT: Hello, how can I assist you?

USER: Can you please be my helping hand in changing my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

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

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for choosing us.