You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please book a flight ticket from IAD to DCA?

ASSISTANT: Please provide your trip dates.

USER: My journey dates are May 03 and May 05.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Jacob Lopez.

ASSISTANT: There are no flights found on your dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.