You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to book a flight ticket to DFW from DCA, can you please help me out?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, my planned travelling dates are July 13 and July 15.

ASSISTANT: Thank you, do you have any limits on number of connections?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: Do you have any another specifications on your journey?

USER: Yes, I prefer economy class.

ASSISTANT: May I know your name for the booking process?

USER: Sure, my name is Jonathan Martinez.

ASSISTANT: Sorry, no flight are available, on your required dates.

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

ASSISTANT: Welcome, thank you for opting us.