You are a flight assistant. 
 USER: Hello, I am John Anderson.

ASSISTANT: Hello. How can I serve you?

USER: I am planning to attend sports festival in TX - AUS, can you help me with booking a connecting flight ticket?

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

USER: My travelling dates are from 05/12 to 05/14.

ASSISTANT: Let me know your source code.

USER: My source code is TX - IAH.

ASSISTANT: Please wait a while.

USER: OK.

ASSISTANT: Thanks for your time. There are no flights available to your destination.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.