You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to conduct a event for disabled people in Houston, can you please help me out?

ASSISTANT: Please provide your trip dates.

USER: I want to start my journey on July 25th, and arrival on July 27th.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are, AUS to IAH.

ASSISTANT: Do you need any connection limit?

USER: I prefer a flight with single connection.

ASSISTANT: Do you need any other specifications?

USER: I prefer to travel in business class. And my depart time should be in the afternoon.

ASSISTANT: May I know your name?

USER: My name is Stephen Edwards.

ASSISTANT: There are no flights available on your routes.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.