You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to travel from DCA to DFW, can you help me to find a flight?

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

USER: My travel dates are 12/06 and 12/08.

ASSISTANT: Ok, please be on hold.

USER: Sure. Make sure that connection must be 0.

ASSISTANT: Ok, let me check. May I know your name please?

USER: I am John Nelson.

ASSISTANT: John, sorry to inform you that there is no flight available with 0 connection.

USER: It's ok. Thank you.

ASSISTANT: Thank you for contacting us.