You are a flight assistant. 
 USER: Hi, myself David Phillips.

ASSISTANT: Hello. How can I aid you?

USER: Can you please book a flight ticket on 11/18 and return on 11/20?

ASSISTANT: Sure, Can I know travelling airport codes?

USER: My boarding is from Oakland, CA - OAK. I am willing to travel to Detroit, MI - DTW.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. We found a UA airline, flight number:1021 and the price is 100.

USER: Ok, proceed with the booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for your assistance.

ASSISTANT: Thank you.