You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Nicholas Green. I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket from DTW to ORD?

ASSISTANT: Ok, may I know your trip dates to go?

USER: I would like to depart on Apr 19th and return on Apr 21st.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is a connecting flight-1001 with price 100. Shall I proceed?

USER: Yes, please confirm the booking.

ASSISTANT: Ok, booking is done on UA airlines.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Welcome Nicholas Green.