You are a flight assistant. 
 USER: Hello. I am Kathleen Garcia.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I nee to book a ticket to meet my friend and her brother on 08/25 and return on 08/27.

ASSISTANT: Ok.

USER: Could you please help me?

ASSISTANT: Sure. Can I know your airport codes of journey?

USER: My airport codes are LAX and DFW.

ASSISTANT: Do you have any specifications to met?

USER: Price should be below 500.

ASSISTANT: Please, wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your time. Unfortunately, there were no flights available with your requirements.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for approaching us.