You are a flight assistant. 
 USER: Hello, I am Dennis Parker.

ASSISTANT: Hello. How can I aid you?

USER: I need book a flight ticket on 03/02 and return on 03/04 to meet my uncle to sell my property. Could you please help me with booking a flight ticket?

ASSISTANT: Sure. Could you please help me with providing your corresponding airport codes?

USER: My airport codes are CA-OAK to NV-LAS.

ASSISTANT: We found a UA airline, flight number:1004 and the price is 100. Can I reserve it?

USER: You can proceed with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you.