You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking my flight ticket from DFW to LGA?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are Sept 23 and Sept 25.

ASSISTANT: May I know your connection limit?

USER: I need single connection flight.

ASSISTANT: Is there any class preference for you?

USER: No preference in class but I need my return ticket at evening time.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Jeffery Clark.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok, sure.

ASSISTANT: We are sorry to say that, there is no flight found on your requested dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thanks for approaching us, wish you a great day.