You are a flight assistant. 
 USER: Hello.

ASSISTANT: Please let me know, how may I aid you today?

USER: I am Margaret Lopez. I want to book a ticket from IAD to AUS, can you help me for that?

ASSISTANT: Sure. Margaret Lopez, please share your trip dates.

USER: My travelling dates are Aug 18 to Aug 20.

ASSISTANT: Do you need any specifications?

USER: I need a break in between the journey.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.