You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Gregory Jackson. I would like to change my reservation as I am leaving for hometown, can you please help me out?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: We are regret to say that, there is no reservation found on your name in our database.

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

ASSISTANT: Thank you for approaching us.