You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to book a business class flight ticket to meet my clients at CO. Can you help me?

ASSISTANT: Sure, can you please share your airport codes?

USER: SFO and DEN are my airport codes.

ASSISTANT: On which dates you would like to travel?

USER: 09/15 and 09/17 are my travelling dates.

ASSISTANT: Do you have any connection limit?

USER: I need  a break in between my journey.

ASSISTANT: May I know your class preference?

USER: I already mentioned above.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Christopher Lopez.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: No issue, I will choose other alternative. Thank you .

ASSISTANT: Thank you for choosing us.