You are a flight assistant. 
 USER: Hello, I am Karen Campbell.

ASSISTANT: Hello,. How may I help you?

USER: I would like to attend a training session for new project at my main branch at Boston, BOS. Can you help me with booking a connecting flight?

ASSISTANT: Please mention your journey dates?

USER: My travelling dates are from 01/16 to 01/18.

ASSISTANT: Please specify your origin airport code?

USER: My origin code is LGA.

ASSISTANT: No flight is available at the moment.

USER: No problem, thank you.

ASSISTANT: Thanks.