You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please reserve me a flight ticket with the name of Laura Wilson?

ASSISTANT: Sure, I will help you. May I know your trip dates?

USER: Thank you. My trip dates are 07/21 - 07/23.

ASSISTANT: Please share me your airport codes?

USER: My airport codes are HOU - AUS.

ASSISTANT: There are no flights with your needs.

USER: Not a problem, thank you.

ASSISTANT: Thank you.