You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am looking to book a flight ticket from DFW to IAD. Can you help me for that?

ASSISTANT: Sure, on which dates would you like to travel?

USER: My travelling dates are Mar 02 and Mar 04.

ASSISTANT: Is there any connection limit?

USER: I prefer to book a single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Deborah Lopez.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there were no flights found on your preferable travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.