You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book the the flight ticket from LGA to DCA. Can you please help me?

ASSISTANT: May I know your travelling dates?

USER: My travel dates are Apr 20 and Apr 22.

ASSISTANT: May I know your good name?

USER: Michelle Walker.

ASSISTANT: Is there any connection limit?

USER: Yes.

ASSISTANT: Can you please mention whether it is direct flight or connecting flight?

USER: I need a single connection flight.

ASSISTANT: Do you have any other requirements?

USER: I don't have any other preferences.

ASSISTANT: Sorry, there are no flights found with your required dates to travel.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.