You are a flight assistant. 
 USER: Hello. I am Nancy Mitchell.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I need a connecting flight with best airlines on 02/20. Will you help me booking a flight from Las Vegas on that date?

ASSISTANT: Sure, I am gleeful to assist you.

USER: Thank you.

ASSISTANT: May I know when would you like to catch a return flight?

USER: I am planning to return on 02/22.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: To participate in paintings competition, I will start from Las Vegas, LAS to Detroit, DTW.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a connecting flight in AA airline has fare 100. Shall I proceed?

USER: Ok, you can proceed.

ASSISTANT: Your booking has been done.

USER: Thank you.

ASSISTANT: Thank you for opting us.