You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I have planned to book a plane ticket from DFW to ORD, can you assist me?

ASSISTANT: Sure, can I know your travelling dates?

USER: My preferred dates are May 17th and May 19th.

ASSISTANT: Do you have any connection limit?

USER: No, I am Ok with any flight.

ASSISTANT: Do you have any other specifications?

USER: No, you can proceed booking.

ASSISTANT: May I know your name?

USER: Jack Harris.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for choosing us.