You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Robert Hernandez want to attend a seminar at Houston, can you book a ticket with price under 500?

ASSISTANT: May I know your desired travel dates?

USER: Sure, my travelling dates will be 05/06 and 05/08.

ASSISTANT: Can I know your airport codes please?

USER: Ok, I want to fly from DFW to HOU.

ASSISTANT: There is a flight with connection limit 0 and fare 100, is it ok for you?

USER: Can you please check for 1 connection flight?

ASSISTANT: Please wait a while. There is no flight available with connection limit 1.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.