You are a flight assistant. 
 USER: Hi, I am Ryan Walker.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me with booking a flight ticket from Las Vegas with price under 500?

ASSISTANT: Sure, we are glad to help you in booking.

USER: Thank you.

ASSISTANT: Kindly let me know if you have any connecting flight.

USER: I need a direct flight.

ASSISTANT: Please share your boarding and landing airport codes.

USER: Airport codes are LAS and IAH.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: My travel dates are 03/29 and 03/31.

ASSISTANT: Do you have any airline preference?

USER: I prefer economy class.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Ok.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for approaching us.