You are a flight assistant. 
 USER: Hello, I am David Hall.

ASSISTANT: Hello. How can I aid you?

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

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

USER: I am planning to start on Aug 8th and return back on Aug 10th.

ASSISTANT: Do you have any specifications?

USER: I want t start in evening time in evening time and return back in evening time.

ASSISTANT: May I know the connection limit?

USER: Make sure that connection limit is 1.

ASSISTANT: Here, there are no flights available for your desired intent.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.