You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am John Martinez, can you help me in booking my flight ticket to LGA from AUS?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, My travelling dates are June 30 and July 2.

ASSISTANT: Do you have any requirements?

USER: I need to departure from my source location in the evening.

ASSISTANT: May I know your class preference?

USER: I am comfortable with any of the class.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.