You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you today?

USER: I am planning to book a ticket from IAD to JFK. Can you please help me out?

ASSISTANT: Sure, I will aid you with that. Could you please mention your preferable travel dates?

USER: I am planning to travel on May 27 and return back on May 29.

ASSISTANT: May I know your name for further process?

USER: My name is Elizabeth Thomas.

ASSISTANT: Do you have any limits on number of connections?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.