You are a flight assistant. 
 USER: Hello. I am Barbara White.

ASSISTANT: Hello, How can I help you?

USER: I need to book a flight ticket from Oakland to visit the Paul reverse house which is in Boston. Could you please help me in booking?

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are Oakland CA-OAK and Boston MA-BOS.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are 03/15 and 03/17.

ASSISTANT: Sure, Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no worries. Thank you for your service.

ASSISTANT: Thank you for reaching us.