You are a flight assistant. 
 USER: Hello. My name is Paul Williams.

ASSISTANT: Hello, how can I help you today?

USER: I am trying to book a flight ticket to SFO to meet my sister, could you please help me?

ASSISTANT: Sure, can I know your travel details?

USER: My preferable travelling dates are from 01/30 to 02/01. Make sure I need one connection only.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: May I know your source airport code?

USER: Sure, my source code is BOS.

ASSISTANT: Sorry Paul, I did not find any flight basing on your details.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.