You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Yes sure, let me know your name?

USER: Myself Kenneth Collins.

ASSISTANT: Sorry, I did not find any reservation on your name to change.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing our service, have a nice day.