You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you today?

USER: I am Margaret Williams. I would like to book a flight ticket to participate in the car racing with my team members in Charlotte.

ASSISTANT: Ok, may I know your boarding and landing airport codes?

USER: My origin is CA-SFO and destination is NC-CLT.

ASSISTANT: Please, ensure your journey dates?

USER: My travelling dates are 11/07 and 11/09.

ASSISTANT: Ok. There are no flights found on your given dates.

USER: Thank you for your great informationn.

ASSISTANT: Thank you for reaching us.