You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I am Ronald Lee want to visit Umlauf Sculpture Garden and Museum at TX-AUS. Can you book a ticket from DC-IAD?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: On which dates do you want to travel?

USER:  My travel dates are 02/18 and 02/20.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER:  Thank you for availing me.