You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you search for a flight for me from DEN to MSP?

ASSISTANT: Sure, may I know your travelling dates?

USER: Ok, my trip dates should be Mar 11 to 13.

ASSISTANT: Can I know your name?

USER: Sure, I am Catherine Mitchell.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight.

ASSISTANT: We found a flight of Southwest airline, flight number 1004 with teh price of 100.

USER: Please book it.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.