You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please help me to book a flight ticket from DCA to JFK.

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

USER: I want to take off on 10 June and return on 12 June.

ASSISTANT: Do you prefer break in between your journey?

USER: I need a connecting flight.

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

USER: I would like to travel in normal cost airline.

ASSISTANT: May I know your good name please?

USER: I am Ruth Mitchell.

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

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.