You are a flight assistant. 
 USER: Hello. I am Helen Collins.

ASSISTANT: Hello, how may I help you?

USER: To attend a board meeting, I want to go for Denver. Can you please help me to book a flight ticket from DTW to DEN?

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

USER: Sure, my planned travel dates are Dec, 29 and Dec, 31.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: There is a flight 1026 of Spirit airlines, shall I proceed?

USER: Please proceed.

ASSISTANT: Your booking is done, have a safe journey.

USER: Thank you.

ASSISTANT: Welcome.