You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit Phoenix for my business meeting, could you please help me to book my flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Thank you very much. I have to start my journey on Aug 12th and also please book my return ticket on Aug 14th.

ASSISTANT: Please share me your source and destination points.

USER: Please check for the best flight from CLT to PHX.

ASSISTANT: May I know your connection limit?

USER: Yes, I prefer for a connecting flight.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the evening and return back in the afternoon time.

ASSISTANT: Your good name please.

USER: My name is Christopher Martinez.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Oh! Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.