You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book flight ticket from DCA to ATL?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My trip dates are July 16 and July 18.

ASSISTANT: Do you need break in between your journey?

USER: I need a break in between the journey.

ASSISTANT: Please let me know if you have any other specifications.

USER: I prefer business class for this trip.

ASSISTANT: May I know your good name please?

USER: Myself Gregory Thomas.

ASSISTANT: Sorry to inform you that there are no flights available for you.

USER: It's ok, thank you for the help.

ASSISTANT: Thank you for choosing us.