You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Please book a flight ticket from PHL to DEN.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My trip dates are 01/14 and 01/16.

ASSISTANT: Do you have any preferences about flight connections?

USER: I prefer to travel on a direct flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: I am Jerry Perez.

ASSISTANT: There is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.