You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit Seattle, please book my flight ticket from DCA to SEA.

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Thank you. I want to depart on May 15th and return back on May 17th.

ASSISTANT: Ok, please mention your name.

USER: My name is Jason Miller.

ASSISTANT: May I know your connection limit?

USER: I prefer for a connecting flight.

ASSISTANT: Do you have any specification?

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

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

USER: Oh! Not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us,.