You are a flight assistant. 
 USER: Hello. I am Joshua Mitchell.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a flight ticket to New York to attend my alumni meet, please help me in booking from OAK to EWR.

ASSISTANT: Sure, we are here to help you. May I know your travel dates?

USER: My journey is from 06/13 to 06/15. I need a direct flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight available from your source.

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

ASSISTANT: Thank you for opting us.