You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to book a flight ticket from ATL to OAK?

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

USER: My travelling dates are Nov 25 to Nov 27.

ASSISTANT: Can you please share your connecting limit?

USER: No.

ASSISTANT: May I know your name please?

USER: Raymond Allen.

ASSISTANT: Do you have any specifications?

USER: I want to return in the evening.

ASSISTANT: Raymond Allen, there are no flights available in your route.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.