You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: Please help me in booking flight ticket from EWR to DTW.

ASSISTANT: Sure, I am here to book a flight ticket. Can you please share your connection limit?

USER: I need a direct flight.

ASSISTANT: On which dates would you like me to book a flight ticket?

USER: My trip dates are Oct 18 to Oct 20.

ASSISTANT: Ok, do you prefer business or economy class?

USER: I would like to travel in economy class.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Can I have your good name please?

USER: Stephen Edwards here.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.