You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: Timothy Thompson here. I want to book a flight ticket from IL -ORD to PA - PHL. Can you help me in that?

ASSISTANT: Sure, I will help you in booking.

USER: Thank you.

ASSISTANT: Can you please forward your journey dates?

USER: I want to start my journey on 09/27 and return on 09/29.

ASSISTANT: Please mention your specifications.

USER: I need a direct flight with in the limit 1000.

ASSISTANT: We are sorry to inform you that there is no flight running on your route according to your given dates.

USER: Ok, it is not an issue.

ASSISTANT: Thank you for opting us.

USER: Thanks for your service.