You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to modify my reservation due to some issues, can you help me out?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Myself Sharon Carter.

ASSISTANT: Ok, hold on for a moment. Let me check in our data base.

USER: Ok.

ASSISTANT: Sorry Carter, there are no flights reserved on your name.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us.