You are a flight assistant. 
 USER: Hi, I am Margaret Turner.

ASSISTANT: Hello. How may I amend you today?

USER: I need to visit Lyndon Baines Johnson library at Austin, TX - AUS. Can you book me a ticket with a direct flight ?

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Sure, may I know the travelling dates?

USER: My travelling dates are 03/19 - 03/21.

ASSISTANT: Shall I have your boarding point?

USER: I would like to board from Houston, TX - IAH.

ASSISTANT: Ok. Please wait a moment, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, but no flights run on your routes on particular day. Thanks for availing us.

USER: Ok, Thanks for the information.