You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book my ticket from DCA to LGA?

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

USER: My trip dates are Oct 20 and Oct 22.

ASSISTANT: May I know your connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer for economy class to travel.

ASSISTANT: May I know your good name?

USER: Ruth Davis here.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.