You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Collins here.

ASSISTANT: How can I assist you?

USER: I want to visit JFK, as it is my favourite holiday spot. Can you please help me in booking my flight from ORD?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: Sure, my planned travel dates are Aug 11th and Aug 13th.

ASSISTANT: In which class do you prefer to travel?

USER: I am comfortable in any class.

ASSISTANT: Do you have any time concerns?

USER: I must return in the afternoon time.

ASSISTANT: Please let me know if you have any other specifications.

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry to say, there are no flights available on those dates with your given details.

USER: Ok, not an issue. Anyways, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.