You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Michelle Lopez here.

ASSISTANT: How may I help you out?

USER: I need to attend a party at Washington, can you please help me in booking a flight ticket from ATL to IAD?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, my travel dates are from 09/27 to 09/29.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Sorry, there are no flights found in our database.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.