You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Alexander Lopez, please help me to search a flight.

ASSISTANT: Sure, on which dates you would like to have your journey?

USER: I want to have my journey on 03/27 and 03/29.

ASSISTANT: May I know your travelling airport codes?

USER: Sure, I want to fly from LAS to LAX.

ASSISTANT: Do you have any other requirements?

USER: Yes, my flight price should not exceed 500.

ASSISTANT: There is a flight-1009 is matches your all requests, shall I proceed with UA airlines?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a safe journey.