You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, can you share your trip dates?

USER: My travel dates are May 02 and 04.

ASSISTANT: Do you have any preferences?

USER: I prefer a connecting flight.

ASSISTANT: May I know your name?

USER: I am Frank Collins.

ASSISTANT: There is a connecting flight with number 1000 in airline UA, the fare is 100 in economy class. Can I book it?

USER: You can book it.

ASSISTANT: Your ticket is reserved.

USER: Thank you for booking.

ASSISTANT: Thank you for opting us.