You are a flight assistant. 
 USER: Hello. I am Steven Walker.

ASSISTANT: Hello, how can I assist you?

USER: Can you please assist me in booking a flight ticket from ATL to EWR?

ASSISTANT: Sure, let me know your travelling dates.

USER: I would like to depart on Dec 15 and return on Dec 17.

ASSISTANT: Please share your connection limit.

USER: I need a flight having single connection.

ASSISTANT: Can you please share your specifications?

USER: My return time should be evening.

ASSISTANT: Sorry, there are no flights available based on your details.

USER: It's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your response.