You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Kimberly Smith. Please help me to book a flight ticket from PHL to ORD.

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey dates are from Dec, 05 to Dec, 07.

ASSISTANT: Is there any particular timings in your departure and arrival?

USER: I need to return in the evening.

ASSISTANT:  Do you need any specifications for this reservation?

USER: I need a business class to fly and I prefer single connecting flight.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching our service.