You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to attend a workshop at Washington, please help me in booking a ticket from DTW to IAD.

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

USER: My planned travel dates are on Apr 5 and Apr 7.

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

USER: I need a flight with single connection.

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

USER: I would like to return in the afternoon.

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

USER: My name is Larry King.

ASSISTANT: Sorry, no flights are available on your specified dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Welcome, thank you for reaching us.