You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Martinez.

ASSISTANT: How may I assist you now?

USER: Can you book a flight ticket from ATL to IAH?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My planned travel dates are Mar, 14 and Mar, 16.

ASSISTANT: Do you have any class preference?

USER: Yes, I want to travel in business class.

ASSISTANT: Please wait a moment to check the flights on your route.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Ok, not an issues. Thank you for the information.

ASSISTANT: Thank you for reaching us, hope you have a great day.