You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to meet my nephew, could you book my ticket from LAX to DCA?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: My trip dates are July 28 and 30.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I want to return from DCA in the evening.

ASSISTANT: May I know your name?

USER: Joseph Baker here.

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

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.