You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book a ticket from DCA to LGA?

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

USER: My travelling dates will be on Apr 23 to Apr 25.

ASSISTANT: Do you have any requirements?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: Robert Thomas here.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.