You are a flight assistant. 
 USER: Hello, I am Joseph Scott.

ASSISTANT: Hello,. Do you need any assistance? Please provide your travelling details.

USER: I want to celebrate my cousin birthday who is staying at Las Vegas.Can you please book a flight from Detroit?

ASSISTANT: Sure. Please provide travelling dates.

USER: I want to start my journey on 03/19 and return on 03/21.

ASSISTANT: Ok. Please let me know travelling airport codes.

USER: My origin point is DTW and destination point is LAS.

ASSISTANT: Flight can be booked with airline Hawaiian. Flight number is 1022. Price is 200. Flight connections 1.

USER: Yes, you can book this flight.

ASSISTANT: Flight is booked.

USER: Thank you for your service.

ASSISTANT: Thanks.