You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ronald Johnson here.

ASSISTANT: Ok, Ronald how can I aid you at this pleasant evening?

USER: I want to go for watching cricket match which is held in San Francisco. So, please book my ticket from DCA to SFO.

ASSISTANT: Ok, sure. Can you please provide me your trip dates?

USER: My trip dates are from 12/01 to 12/03. Please make sure this, I want a direct flight.

ASSISTANT: Ok, wait for a moment.I'll check and let you know whether there is a direct fight or not.

USER: Sure.

ASSISTANT: Sorry Ronald, there is no flight  found with direct connection.

USER: It's ok. Thank you for your valuable time.

ASSISTANT: Thank you for reaching us.Have a nice day.