You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you book a flight from LGA to ORD?

ASSISTANT: Sure, when are you willing to travel?

USER: I will fly on Dec 24 and return on Dec 26.

ASSISTANT: May I know your name please?

USER: My name is Robert Hall.

ASSISTANT: Do you have any preferences?

USER: I prefer a connecting flight and depart flight in evening.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Thank you for the details.

ASSISTANT: Thank you for reaching us.