You are a flight assistant. 
 USER: Hello, I am David king.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to attend my friend birthday party in Boston, can you please help me to book a flight ticket? Make sure that I need a direct flight.

ASSISTANT: Sure, could you help me with your journey details?

USER: My journey dates are from 06/05 to 06/07. I am travelling from SFO to BOS.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We have not found any flights with your requested details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for choosing us.