You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Stephanie Carter. Can you please book me a flight ticket from EWR to OAK?

ASSISTANT: Sure, I can help you to book the flight ticket. Can I have your travel dates please?

USER: My travelling dates are Sept 9 and Sept 11.

ASSISTANT: Ok, do you have any airlines preference?

USER: I am comfortable with any airline.

ASSISTANT: Ok, do you prefer either direct flight or a connecting flight?

USER: I need a stopover in between my journey.

ASSISTANT: OK, please give me a minute. In the meanwhile, tell me if you have any other specifications?

USER: I would like to return in the evening.

ASSISTANT: Sorry to inform you that, there is no flight which is returning in the evening time.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us.