You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please book a flight ticket in business class from Washington?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates to book a flight ticket?

USER: Sure, my travelling dates are 11 Sept and 13 Sept.

ASSISTANT: May I know your source point and destination point?

USER: Yes, my source code is DCA and MSP.

ASSISTANT: Let me know your name?

USER: My name is Janet Roberts.

ASSISTANT: Ok, wait for some time.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for approaching us.