You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please book a ticket from ORD to DEN to go for Innovation festival.

ASSISTANT: Sure, can you share your trip dates?

USER: My scheduled dates are Nov 29 and Dec 1.

ASSISTANT: Do you have any connection limit?

USER: I want a direct flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Are there any other specialisations?

USER: No.

ASSISTANT: Please forward your name.

USER: I am Margaret Lopez.

ASSISTANT: Thanks for your details, there are no flights found on your specified trip dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.