You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Samuel Hall. I would like to change my reservation as I would like to go for holiday trip to another place, can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation with your name to change further.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for approaching us, have a great day.