You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Carolyn Jackson here, I would like to travel from IAD to AUS, can you please help me to book a ticket?

ASSISTANT: I am happy to help you Jackson, can you please tell me your trip dates?

USER: Sure, my dates of journey is from 10/15 to 10/17. Please make sure that the price limit is 200.

ASSISTANT: Ok, please wait for a moment. I will check for the available flights and get back to you.

USER: Ok, please proceed with this ticket booking.

ASSISTANT: Sorry Jackson, there are no flights available on your preferred dates.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us and have a nice day.