You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket to SFO. Can you please assist me for booking a flight ticket in a direct flight?

ASSISTANT: Sure, I am here to assist you. Can I know when you want to travel?

USER: Thank you. My planned dates are Feb 22 and 24.

ASSISTANT: Ok, may I know your source code please?

USER: Ok, I am boarding from BOS.

ASSISTANT: Would you let us know that you have any class preference?

USER: No.

ASSISTANT: Please share your name.

USER: George Nelson is my name.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No.

ASSISTANT: Thank you for providing your journey details, please wait a moment I'll search best flight for you.

USER: Sure.

ASSISTANT: Thank you for being patient, we didn't find any flights which matches your requirement.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for reaching us, have a nice day.