You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my trip dates in my ticket. Can you help me?

ASSISTANT: Sure, I am here to help you. Can you please provide me your name?

USER: My name is Dorothy Green.

ASSISTANT: Green, let me check your reservation status.

USER: Ok, take your time.

ASSISTANT: Green, I have not found any reservation by your name.

USER: It's ok, thank you for searching.

ASSISTANT: Thank you for choosing us.

USER: Welcome.