You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Could you please help me in booking a flight ticket from DFW to OAK?

ASSISTANT: Sure, can you please mention your connection limit?

USER: I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: My name is James Hall.

ASSISTANT: May I know, on which dates would you like to travel?

USER: I want to travel on Dec 26 and return back on Dec 28.

ASSISTANT: Are there any more specifications in your journey?

USER: I want to depart in the evening and return in the afternoon.

ASSISTANT: Sorry to inform you that, we did not find any flights matching your requirements.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.