You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you at this moment?

USER: I am Stephen Thomas and I want to head from NY-LGA to NY-EWR to participate in world health conference. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know the dates when you are willing to travel?

USER: I will start on 08/03 and my return will be on 08/05.

ASSISTANT: Sorry Thomas, all flights tickets been booked for the dates you are looking, shall you want on any other dates?

USER: No, thanks for your assistance.

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