You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Carter.

ASSISTANT: How can I help you today?

USER: Can you assist me in finding a best flight which should depart in the evening?

ASSISTANT: Sure, I am here to help you in booking,. Could you please share your travel dates?

USER: My trip dates will be Nov 19th to Nov 21.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My source is SFO, my landing point is PHX.

ASSISTANT: Do you have any specification? Here, I found a flight for you with 1 stopover and it costs you 100. Can I proceed?

USER: I prefer a business class flight which should be connecting flight.

ASSISTANT: Sorry, no flights are available with your request on your route.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us, have a nice day.