You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to attend a business meeting at Austin, can you please book a ticket ?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: My preferred dates of travel are from 12/09 to 12/11.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from NC-CLT to TX-AUS.

ASSISTANT: can you help me with your name?

USER: Sure, I am Larry Martin.

ASSISTANT: Thank you for your details. Sorry, we did not found any flights based on your given details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.