You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ryan Williams here.

ASSISTANT: How can I assist you now?

USER: I want to travel from LAS to IAH for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My travelling dates are from 07/23 to 07/25. Make sure my connections limit is 0.

ASSISTANT: Ok Ryan Williams, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry Ryan Williams, no flight is available to you on your dates with connection 0.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us, have a good day.