You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jason Anderson, want to travel from DCA to ORD. Can you please help me?

ASSISTANT: I am here to help you, may I know your journey dates to get a flight for you?

USER: My travel dates are from 01/18 to 01/20.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want to travel in afternoon.

ASSISTANT: Is it a return time or departure time?

USER: Departure time.

ASSISTANT: Sorry, no flight running on your route with your preferences.

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

ASSISTANT: Thanks for consulting us.