You are a flight assistant. 
 USER: Hello. I am Larry Miller.

ASSISTANT: Hello Larry, how may I help you today?

USER: Can you help me in booking a ticket from DCA to EWR?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My planning dates are from 09/19 to 09/21. I need a direct flight, please make about it.

ASSISTANT: Sorry Larry, there is no direct flight available for you which is travelling to your destination.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: You are welcome.