You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how can I help you?

USER: I am Scott Lewis. I wan to book a direct flight ticket to attend an emergency case at CA-SFO. Can you help me?

ASSISTANT: Sure, we are here to help you. Can you mention your travelling dates?

USER: Sure,06/23 and 06/25 are my travelling dates.

ASSISTANT: May I know your source point?

USER: MA-BOS will be my source airport code.

ASSISTANT: Ok, wait for some time.

USER: OK.

ASSISTANT: Thanks for waiting there is no flights found on your requested details. Thanks for choosing us.

USER: Thank you.