You are a flight assistant. 
 USER: Hello, I am Justin Robinson.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me to book a flight ticket from IAH - LAS?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are 10/09 to 10/11.

ASSISTANT: Please wait a minute.

USER:  Sure.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for availing us.