You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to celebrate my birthday at Detroit, please help me in booking a ticket from DFW to DTW.

ASSISTANT: Can you share your trip dates?

USER: My planned travel dates are on Apr 23 and Apr 25.

ASSISTANT: Do you need any connections?

USER: I need a flight with single connection.

ASSISTANT: Are there any other preferences?

USER: I prefer business class for my trip.

ASSISTANT: May I know your name?

USER: My name is Jason Lewis.

ASSISTANT: Sorry to say that, there is no flight found with your details.

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

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.