You are a flight assistant. 
 USER: Hello. My name is Scott Mitchell.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from SFO to DCA, could you help me out?

ASSISTANT: May I know your trip dates?

USER: My preferable dates are from 10/31 to 11/02. Please check for direct flights.

ASSISTANT: Sorry, there is no flight available.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Most welcome.