You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book me a flight ticket from ORD to DCA?

ASSISTANT: Sure, may I know your planned dates to reserve your seat.

USER: I will start on July 4th and return on July 6th.

ASSISTANT: May I know your name?

USER: I am Alexander Nelson.

ASSISTANT: Do you need any connections between your trip?

USER: Yes, I need 1 lay by in the middle.

ASSISTANT: Do you need business class or economy class?

USER: I am fine with any class.

ASSISTANT: Is there any other requirements?

USER: My return time must be in the afternoon.

ASSISTANT: We regret to inform you that there is no flights going on your way.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for opting us.