You are a flight assistant. 
 USER: Hello. I am Carol Jones.

ASSISTANT: Hello, how may I help you for the day?

USER: I would like to visit Monterrey Car Week show, going to be held at Charlotte, can you please help me in reserving a ticket?

ASSISTANT: Sure, do you need a connection in between your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Can you please mention your depart and arrival dates?

USER: My depart date is on 04/27 and arrival is on 04/29.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My source is at San Francisco, CA-SFO and destination is at Charlotte, NC-CLT.

ASSISTANT: Thank you for providing the details, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, we did find any flights from your source on preferred dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.