You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Green.

ASSISTANT: How may I assist you today?

USER: I am planning to visit Flower festival at Chicago with my family, so please help me to find a flight on 10/16.

ASSISTANT: Sure, I am here to check with flights and book a ticket.

USER: Thank you.

ASSISTANT: May I have your airport codes of both routes?

USER: Airport codes are from New York, LGA to Chicago, ORD.

ASSISTANT: Will you like to travel with a connecting or direct flight?

USER: I need a direct flight.

ASSISTANT: Please specify the return date.

USER: Return date is on 10/18.

ASSISTANT: Sorry to inform you that, no direct flight run on specific dates.

USER: Ok, thanks for your response.

ASSISTANT: Thanks for availing us, Have a great day.