You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me in booking a flight ticket from Las Vegas, LAS to Houston, IAH?

ASSISTANT: Sure, May I know the travelling dates?

USER: My journey dates are from Sept 24 to Sept 26.

ASSISTANT: Do you have any connection limit?

USER: I need a lay by in between journey.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Donald Taylor.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us.