You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for the day?

USER: I would like to change my reservation due to an emergency work, help me in changing my reservation with the name Kenneth Lewis.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found based on your name.

USER: Its ok, thank you for your assistance.

ASSISTANT: Thank you for choosing us.