You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I want to book a ticket from LGA to DCA. Could you book a ticket?

ASSISTANT: May I know your travelling dates please?

USER: Travelling dates are from June, 21 to June, 23.

ASSISTANT: Please let me know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Can I know your preference?

USER: I would like to depart in the morning.

ASSISTANT: May I know your name please?

USER: My name is Patrick Nelson.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no flights available on your route.

USER: Thank you.

ASSISTANT: Thank you for choosing us.