You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jeffrey Campbell.

ASSISTANT: Jeffrey, how can I help you?

USER: I want to attend a meeting in Houston.Can you book a ticket from TX - IAH to NC - CLT?

ASSISTANT: Sure, may I know the travelling dates?

USER: I want to depart on 07/20 and return on 07/22. The connection limit is 0.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting Jeffrey.

USER: Ok.

ASSISTANT: Sorry, there is no flight with 0 connection.Can I proceed?

USER: No, I don't want to continue with that flight.

ASSISTANT: It's fine. Thank you.

USER: Thank you for your help.

ASSISTANT: You are welcome.