You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to book a ticket from ORD to JFK, can you please help me out?

ASSISTANT: Sure, can you please let me know your preferred dates of travelling?

USER: I am travelling on these dates Aug 29th and 31st.

ASSISTANT: May I know your name please?

USER: Gregory Nelson here.

ASSISTANT: In which class you wish to travel?

USER: I don't have any other preferences except single connected flight.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights are available matching your specifications.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.