You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Donald Hernandez here. I want to attend a Marriage in Chicago. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, please let me know if you need a connecting flight or direct flight.

USER: I would prefer single halt.

ASSISTANT: When are you planning to travel?

USER: My travelling dates are 04/14 and 04/16.

ASSISTANT: Kindly share your airport codes.

USER: My airport codes are LGA and ORD.

ASSISTANT: Ok, let me check what flights are available for you.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for consulting us.