You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you out today?

USER: I am Jessica Baker.

ASSISTANT: Ok.

USER: I am planning to visit NASA Space Center at Houston, HOU. Can you please book a ticket from Austin?

ASSISTANT: Sure, I will help you in this. Can you mention your planned dates?

USER: My trip dates are 04/22 to 04/24.

ASSISTANT: May I have your origin please?

USER: Origin code is AUS.

ASSISTANT: Thanks for sharing the details, but no flight s in search on your routes.

USER: Ok, No problem.

ASSISTANT: Thanks for opting us, Have a nice day.

USER: Thank you.