You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Jeffrey Evans, want to alter my reservation dates. Can you please help me?

ASSISTANT: Sure, I can help you in that. Please wait for a while.

USER: Ok.

ASSISTANT: Jeffrey Evans, there is no active reservation found under your name to do modifications in that.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a great day.