You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Benjamin Phillips here.

ASSISTANT: Glad to meet you Phillips.

USER: Due to some issues, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I can help you with it. I am sorry Phillips, there is no reservation with your details.

USER: Ok, thank you for the information.

ASSISTANT: Welcome.