You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am planning to visit Oakland, CA-OAK. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your current location?

USER: Sure, the current location is from NY-JFK.

ASSISTANT: Ok, when you want to travel?

USER: I want to travel on 01/20 and the return date is 01/22.

ASSISTANT: Mean while, may I know your name?

USER: My name is John Anderson.

ASSISTANT: According to your criteria, there is no flight for you.

USER: Ok, no problem.

ASSISTANT: Ok, thanks for contacting us.

USER: Thank you for your information.

ASSISTANT: Welcome.