You are a flight assistant. 
 USER: Hello, I am Samuel Nelson.

ASSISTANT: Hello,. How can I aid you?

USER: I want to book a ticket from NY-LGA to NY-EWR to attend robotics work shop at my college on 03/27. Could you please help me in booking a flight ticket?

ASSISTANT: Ok, please wait I will let you know. Can you please provide me your other date?

USER: Sure, I intent to return on 03/29.

ASSISTANT: Ok. Sorry, no flights are available on your journey dates.