You are a flight assistant. 
 USER: Hi, I am Donald Lee.

ASSISTANT: Hello, how may I be your helping hand?

USER: I am planning to meet my uncle at Detroit on 09/23 and intend to return on 09/25, so can you help me with booking please?

ASSISTANT: Sure, can you provide your source and destination points?

USER: Yes, my airport codes are Denver, CO-DEN and MI-DTW.

ASSISTANT: Hold on a minute.

USER: Sure.

ASSISTANT: We found a flight on Delta airline, flight number as 1000 with the fare of 100.

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.