You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to attend live music concert at Washington, can you please reserve flight ticket from LAS to DCA?

ASSISTANT: Sure, may I know your planned trip dates?

USER: Sure, my planned travelling dates are Sep, 19 and 21 respectively.

ASSISTANT: Do you have any connection limit?

USER: Yes, flight has to be with single connection.

ASSISTANT: Any other requirements to be met?

USER: Yes, I would like to travel in normal cost airlines.

ASSISTANT: May I know your good name?

USER: Jennifer Green here.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.