You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit San Francisco, can you please book me a ticket from CLT to SFO.

ASSISTANT: May I know your airport codes please?

USER: My preferable journey dates are from 12/23 to 12/25.

ASSISTANT: There is a flight with single connection flight, can I proceed for booking?

USER: Please reserve my ticket with the name Timothy Clark.

ASSISTANT: Your booking is confirmed in 1018.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing.