You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from EWR to DTW for my business meeting, can you please help me out with flight ticket booking?

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: Thank you, my boarding is on Dec 21 and please book my return ticket on Dec 23.

ASSISTANT: Do you need any layover in between  journey?

USER: Yes, I am looking for it.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I would like to departure in morning time and I will prefer to travel in a economy class flight.

ASSISTANT: May I know your name for the documentation process?

USER: Sure, my name is Larry Roberts.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for checking.

ASSISTANT: Thank you for choosing us.