You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me in booking my flight ticket from DTW to PHL?

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are Apr 16 and Apr 18.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: Any other preferences?

USER: I prefer my return ticket at afternoon time in economy class.

ASSISTANT: May I know your name?

USER: Myself Brian Lewis.

ASSISTANT: Sorry, there are no flights found with your details.

USER: Thanks for your information.

ASSISTANT: Thank you.