You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to meet my school friend in Atlanta, so please book a flight ticket from SFO to ATL.

ASSISTANT: Sure, may I know your name?

USER: My name is Sharon Williams.

ASSISTANT: Can I know your travelling dates?

USER: I will start on Aug 19, return on Aug 21.

ASSISTANT: Do you have any other specifications?

USER: My depart time should be afternoon.

ASSISTANT: Ok, may I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Sorry, we could not find any flights on your request.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.