You are a flight assistant. 
 USER: Hello, this is Andrew Lee from Los Angeles.

ASSISTANT: Hello, how can I be your helping hand?

USER: I have an important meeting with my project manager in my company head quarters in Austin so, please help me in booking a flight ticket in advance.

ASSISTANT: Sure, I will help you in booking.

USER: Thank you.

ASSISTANT: May I know on which dates do you want to travel?

USER: I want to travel on 02/10 and on 02/12.

ASSISTANT: Please share your airport codes?

USER: LAX and AUS are my preferred airport codes.

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

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your specified details.

USER: Not a problem, leave it. Thanks for the information.

ASSISTANT: Thank you for choosing us.