You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER: Can you please help me in booking a flight ticket from DTW to EWR?

ASSISTANT: Sure, I am here to help you. May I know your travel dates, please?

USER: Sure, my travel dates are from July 25 to July 27.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I prefer business class for my journey.

ASSISTANT: May I know about your other preferences?

USER: No, I don't have any specifications.

ASSISTANT: Let me know your name to proceed.

USER: Edward Allen here.

ASSISTANT: Sorry, there are no flights available as per your specifications.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.