You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travel dates are Dec 22 and Dec 24.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My depart and return time is in the evening.

ASSISTANT: May I know your other specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry, no flight is available for you.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.