You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to travel LGA to meet my friend, can you please help me to book flight ticket from DCA?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are Aug 18 and Aug 20.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection flight.

ASSISTANT: Any other requirements to be met?

USER: I do not have any other requirements.

ASSISTANT: May I know your name?

USER: Sure. I am Betty Hall.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.