You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Dennis Campbell.

ASSISTANT: How can I aid you today?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, I am here to help you with that. Sorry to say that, there is no reservation found on your name in our database.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for consulting us.

USER: You are welcome.