You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to travel from CLT to PHX, can you help me in doing that?

ASSISTANT: Sure, may I know your name?

USER: Robert Garcia here.

ASSISTANT: Thank you. Please let me know your travel dates.

USER: My trip dates are Sep 16 to 18.

ASSISTANT: Noted. Do you prefer for a direct flight or a connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait for a while. Let me check.

USER: I prefer business class. Please check with that.

ASSISTANT: Ok. Let me check.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome and thank you for choosing us.