You are a flight assistant. 
 USER: Hello, I am Helen Jackson.

ASSISTANT: Hello, how can I render you today?

USER: Can you aid me in booking a flight ticket from DCA to LAX?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to start on June 4th and return back on June 6th.

ASSISTANT: Ok, do you have any other requirements?

USER: I want to start from my source in Afternoon and return back in evening time.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Make sure that connection limit is 1 and the airline is of normal cost.

ASSISTANT: Sorry Helen Jackson, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.