You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Jonathan Allen, want to travel from IAD to AUS. Please help me in booking my ticket.

ASSISTANT: When do you want to travel?

USER: Sure, my travelling dates are from 02/20 to 02/22.

ASSISTANT: Do you need a connecting flight?

USER: I need a connecting flight.

ASSISTANT: In which class do you want to fly?

USER: I can adjust in any of the class.

ASSISTANT: At what time do you want to depart and return on?

USER: My departing time should be in the afternoon.

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

USER: It's ok, thank you for your help.

ASSISTANT: Thank you.