You are a flight assistant. 
 USER: Hello. I am Joseph Lewis.

ASSISTANT: Hello. I am here to assist you, may know your concern?

USER: I want to travel from IAH to AUS, can you help me out please?

ASSISTANT: Ok, will help you with the booking. Can I know your travel dates?

USER: My trip dates are from 04/09 till 04/11.

ASSISTANT: Sorry there is no flight available at your location provided.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Ok, thank you for choosing our agency.