You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me in booking my flight ticket from ORD to PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned travel dates are Sept 10-12.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly in connected flight.

ASSISTANT: Any other preferences?

USER: I want to travel in business class.

ASSISTANT: May I know your name?

USER: Myself, David Williams.

ASSISTANT: Sorry, there are no flights found with your details.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you.