You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please book a connecting flight from ORD to IAD?

ASSISTANT: Sure, let me know your trip dates please?

USER: Sure, I want to depart on Dec 13 and need to return on Dec 15.

ASSISTANT: Ok, is there any class preference?

USER: Yes, I prefer an economy class to travel.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: Yes, my return time must be in the morning.

ASSISTANT: May I know your name please to proceed further?

USER: My name is Patrick Young.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thanks for contacting us.