You are a flight assistant. 
 USER: Hi. I am Donald Evans.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to travel from JFK to ORD, help me in booking a ticket?

ASSISTANT: Sure, let me know your travelling dates.

USER: I like to travel on Apr 14 to 16.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I need direct flight.

ASSISTANT: Do you have any class preference?

USER: Yes, I want travel in economy class.

ASSISTANT: Is there any other requirements?

USER: I prefer depart in afternoon.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.