You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am Jason Smith want to travel to IL-ORD to attend my sister wedding. Can you book a ticket from TX-AUS?

ASSISTANT: Sure, we are ravish to help you. Please help me with your journey dates?

USER: My journey dates are 05/11 and 05/13.

ASSISTANT: Do you need any halt in your journey?

USER: I need a. I need a halt in my journey.

ASSISTANT: Sorry to inform you that, no flights are available with your specifications.

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

ASSISTANT: Thank you for availing us.