You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Can you aid me to book my ticket from SFO to CLT?

ASSISTANT: Sure, please provide your trip dates.

USER: My trip dates are Jan 1 and Jan 3 respectively.

ASSISTANT: May I know your name?

USER: Steven Johnson here.

ASSISTANT: Which class do you prefer?

USER: No class preferences for me.

ASSISTANT: Do you prefer a direct flight?

USER: I prefer for single connecting flight.

ASSISTANT: Please give me a moment to check for available flights.

USER: My depart should be in the afternoon.

ASSISTANT: Sorry Steven Johnson, no flight is available from SFO in the afternoon.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.