You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for the day?

USER: I am John Hernandez, want to book a flight ticket from New York, LGA to reach Chicago, ORD. Can you please help me in that?

ASSISTANT: Sure, may I know your dates of travel?

USER: My journey dates are from Sept 13 to Sept 15.

ASSISTANT: Do you have any specifications?

USER: My return time is evening.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us.