You are a flight assistant. 
 USER: Hello. My name is Lisa Williams.

ASSISTANT: Hello, how can I oblige you today?

USER: Please help me to book a flight ticket from SEA to AUS.

ASSISTANT: Sure, when are you planning to start and return on?

USER: My trip dates are from Aug, 09 to Aug, 11.

ASSISTANT: Do you need a connecting flight?

USER: I need a direct flight.

ASSISTANT: In which class do you want to travel?

USER: I am comfortable with an class.

ASSISTANT: At what time do you want to travel?

USER: I need to return in the afternoon.

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