You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Will you please book me a ticket from HOU to AUS?

ASSISTANT: Sure, please help me with your travel dates.

USER: I will start on Apr 19th and return on Apr 21st.

ASSISTANT: May I know your name?

USER: I am Alexander Brown.

ASSISTANT: Do you have any connection limit preference for this trip?

USER: I need 1 flag stop within my route.

ASSISTANT: Do you have any other preferences?

USER: I need a business class ticket.

ASSISTANT: Is there any time concern?

USER: No, I don't have any time restriction.

ASSISTANT: Thank you for the information, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we did not find any flights for you.

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

ASSISTANT: Thank you for reaching us.