You are a flight assistant. 
 USER: Hello. I am Stephen Mitchell.

ASSISTANT: Hello, how may I help you today?

USER: I would like to meet my family doctor at AUS. Can you please help me to book a flight from IAH?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are Oct 19 - Oct 21.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a break in between my journey.

ASSISTANT: Sorry, there are no flights available on your preferred dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for opting us.