You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a ticket from DTW to ORD, can you help me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My trip dates are Feb 01 and 03.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Do you have any preferences about flight connections?

USER: I prefer a direct flight in my journey.

ASSISTANT: Please mention your name.

USER: I am Mark Martinez.

ASSISTANT: There are no flights found under your preferable details.

USER: No problem, thanks for checking.

ASSISTANT: Welcome, have a great day.