You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me in booking my flight ticket from DEN to DCA?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: When did you scheduled to travel?

USER: My trip dates will be Jan 26th to Jan 28th.

ASSISTANT: Do you need any way station in your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any specific time to travel?

USER: I prefer a business class.

ASSISTANT: Do you have any other requirements?

USER: No, thank you.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Its ok, thank you.

ASSISTANT: For references, can I have your name please?

USER: I am Jacob Johnson.

ASSISTANT: Thank you for choosing our services, we will try to serve you for the next time.

USER: Its ok, thank you.