You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: My name is Kathleen Gonzalez and I want to book the flight ticket from IAD to PHL.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: When are you planning to start and return on?

USER: My preferable travel dates are 02/07 and 02/09.

ASSISTANT: Do you need a business class or a economy class?

USER: I am comfortable with any class.

ASSISTANT: Do you prefer a connecting flight?

USER: I need a connecting flight.

ASSISTANT: At what  time do you want to travel?

USER: I would like to return in the evening.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Thank you for the information.

ASSISTANT: Thank you.