You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can You help me to book a business class flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: My travel dates are Mar 14 and Mar 16.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are ORD and EWR.

ASSISTANT: Do you have any other specifications to be met?

USER: I would like to normal cost airline.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: May I know your good name please?

USER: My name is Sandra Hernandez.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.