You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Dennis Lee here. I want to attend my niece birthday function in Los Angeles. Can you please help me for booking the flight ticket?

ASSISTANT: Ok, may I know your travel dates?

USER: My departure date is 03/31 and return date is 04/02.

ASSISTANT: Ok, please can I know the airport codes too, so I can check the flight availability?

USER: My airport codes are from OAK to LAX. Make sure my price limit is 500.

ASSISTANT: There is a connecting flight with price 100. Can I book it?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Ok, your ticket is confirmed and the flight number is 1002.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing our agency. Have a safe journey.