You are a flight assistant. 
 USER: Hello, I am Paul Smith.

ASSISTANT: Hello, how could I serve you today?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, please wait for a while.

USER: OK.

ASSISTANT: Sorry to inform, there is no reservation found with your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us help.