You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me to book a flight ticket from ORD to LGA?

ASSISTANT: Sure, can you mention your trip dates?

USER: My trip dates are 04/21 and 04/23.

ASSISTANT: Do you have any connection limit?

USER: I prefer a direct flight.

ASSISTANT: Are there any other preferences?

USER: Yes, I need a ticket of business class.

ASSISTANT: May I know your name?

USER: Barbara Carter here.

ASSISTANT: Sorry, there is no flight found found with your details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.