You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Helen Gonzalez. Can you help me in finding a flight from AUS to DCA?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: My trip dates will be 15th to 17th of Oct.

ASSISTANT: Do you need any way station in your route?

USER: Yes, I prefer a way station with in my journey.

ASSISTANT: Is there any class preference for you?

USER: I am comfortable with any class.

ASSISTANT: May I know your departure time and arrival time?

USER: Make sure that the depart time should be afternoon.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Its ok, I will go with another alternative. Thank you for your assistance.

ASSISTANT: Thank you for reaching us, we will try to serve you for the next time.