You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good evening! How can I assist you?

USER: Can you help me to book a connecting flight ticket?

ASSISTANT: Sure, I'm happy to help you. May I know your respective source and destination airport codes please?

USER: My airport codes are ATL and DCA.

ASSISTANT: Ok, may I know on which dates are you planning to depart and arrive?

USER: My travel dates are May 30 and June 01.

ASSISTANT: Fine, how many connecting flights are you expecting in between your journey?

USER: I have already mentioned above.

ASSISTANT: Ok, are you ok with economy or business class flight?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any other specifications, I'll search for the flights according to that.

USER: I would like to depart and return back in the afternoon time.

ASSISTANT: Fine, can I have your good name please?

USER: I am Steven Baker.

ASSISTANT: Thanks for providing your journey details, please wait for a while.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, hope we will meet again.