You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I  am Barbara Carter. I want to book a direct flight to San Francisco as I have an emergency case to deal with. Please help me out.

ASSISTANT: Ok, please help me with your dates of journey.

USER: My travelling dates are from 01/18 to 01/20.

ASSISTANT: Kindly, mention your source code.

USER: I want to fly from SEA to SFO.

ASSISTANT: OK, please hold on.

USER: Ok.

ASSISTANT: Sorry to say that, no direct flight found on your dates.

USER: No issues, thank you.

ASSISTANT: Thank you for serving you, have a nice day.