You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from DTW to DFW. Could you book a ticket?

ASSISTANT: Sure, may I know the travelling dates?

USER: Departure date is Apr, 1 and return by Apr, 3.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Is there any other requirements?

USER: I would like to depart in the evening time.

ASSISTANT: May I know your name?

USER: My name is Stephanie Hernandez.

ASSISTANT: Sorry, no flights found with your preferable dates.

USER: Thanks.

ASSISTANT: Thank you for opting us.