You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Brandon Taylor. Can you please help me in booking the ticket from LAS to DCA?

ASSISTANT: Sure, please share your travelling dates.

USER: My travelling dates are 05/08 and 05/10.

ASSISTANT: Do you have any connection preference?

USER:  I need a connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: No problem, thank you for the response.

ASSISTANT: Thanks for reaching us.