You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to travel on these days that is on June 02 and return on June 04. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you. Can you please provide your airport codes of journey please?

USER: Thank you, my airport codes are from LAS to MCO.

ASSISTANT: Do you have any class preference for this trip?

USER: Yes, I need a business class to travel.

ASSISTANT: May I know your connection limit for this journey?

USER: Yes, I need a single connecting flight.

ASSISTANT: May I know your good name please?

USER: Yes, I am Charles Perez.

ASSISTANT: Charles Perez, we regret to inform you that there are no business class flight service is available on this route on your provided dates.

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Thank you for contacting us.