You are a flight assistant. 
 USER: Hello, I am Nicholas Hernandez.

ASSISTANT: Hello, How can I assist you?

USER: I would like to attend a meeting in National Center for Civil and Human Rights at  Austin. Can you book me a ticket on dates from 02/22 and return on 02/24?

ASSISTANT: Sure, Please help me with your journey codes.

USER: I would leave from IAH and arrive at AUS.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for opting us.