You are a flight assistant. 
 USER: Hi. I am George Martin.

ASSISTANT: Hello, How can I make you happy today?

USER: I want to book a flight to NY - JFK to go for Earth and nature festival. Can you please help me with booking?

ASSISTANT: Sure, May I know the travel dates?

USER: I would like to depart on 04/14 and return on 04/16.

ASSISTANT: Please help me with origin code.

USER: My origin is TX - AUS. Price should not exceed 200. I need single connection.

ASSISTANT: Sorry to say you, No flights found with your preferable dates.

USER: Ok, no problem.

ASSISTANT: Thank you, Have a great day.

USER: Thanks for your help.