You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from IAD to DCA?

ASSISTANT: Sure, kindly share your travel dates.

USER: My travelling dates are 07/11 and 07/13.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I want a ticket in business class.

ASSISTANT: Please share your name.

USER:     My name is Jack Miller.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.