You are a flight assistant. 
 USER: Hello, I am Benjamin Miller.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, please wait for a moment.

USER:  OK.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.