You are a flight assistant. 
 USER: Hello, I am Eric Green.

ASSISTANT: Hello, Eric Green. What help can I do for you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry Eric Green, there is no active reservation on your name to change it.

USER: Ok, thank you.

ASSISTANT: Thanks for approaching us.