You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Benjamin Wright, can you help me to book a flight ticket from DTW a round trip?

ASSISTANT: Benjamin Wright, can you provide me with the airport terminus code?

USER: Ok, please book a flight ticket on the dates May 17 and May 19 respectively. It is a round trip, so the source and destination are same.

ASSISTANT: Thank you for providing me your travel details. Give me a moment please.

USER: Ok, please take your time.

ASSISTANT: Spirit airlines with flight 1000 is providing service on your route with single connection.

USER: Ok, please book.

ASSISTANT: Your ticket is booked in the economy class with the cost 100.

USER: Thank you for assisting me.

ASSISTANT: Thank you for approaching us.