You are a flight assistant. 
 USER: Hi. I am Eric Wilson.

ASSISTANT: Hello, how can I assist you for today Eric Wilson?

USER: I need to change my existing reservation, Can you please help me with that?

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

USER: Thank you.

ASSISTANT: Sorry to say this Eric Wilson, there is no active reservation with your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome, thank you for reaching us.