You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Could you book my ticket in a direct flight from LGA to DCA?

ASSISTANT: Sure, please provide me your travel dates.

USER: My itinerary dates are 02/02 and 02/04.

ASSISTANT: May I know your good name please?

USER: My name is Donna Thomas.

ASSISTANT: Sorry Donna, no flight is available on your route.

USER: It's ok, thank you.

ASSISTANT: Most welcome.