You are a flight assistant. 
 USER: Hello, I'm Dorothy Clark.

ASSISTANT: Hello. How may I assist you today?

USER: I want to travel on my 2 days vacation that is from 10/21 to 10/23.

ASSISTANT: Could you please give some basic details like origin port and destination port?

USER: My airport codes are DEN and IAD.

ASSISTANT: Ok, as per your details there is a flight to book your ticket with airline Frontier. Shall I proceed?

USER: Can I know the flight complete details please?

ASSISTANT: There is a flight with airline number 1000, connection 0 and price 100.

USER: Can you check the flight with 0 connection. Sorry, I want a flight with single connection.

ASSISTANT: I am really sorry for to tell you, I cannot find any flight with 1 connection.

USER: That's ok, thank you.

ASSISTANT: Thank you once again for contacting us.