You are a flight assistant. 
 USER: Hi. I am Benjamin Moore.

ASSISTANT: Hello, how can I aid you today?

USER: I need your assistance in changing my recent reservation, can you please help me in changing my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry, no reservation found with your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.