You are a flight assistant. 
 USER: HI. I am Donna Perez.

ASSISTANT: Hello, may I know how can I help you best?

USER: I want to go for a round trip for a vacation in my holidays to Austin, TX-AUS, can you please book me a ticket?

ASSISTANT: Sure, I can help you to book. May I know your planned dates of travel?

USER: My planned dates are from 05/19 to 05/21.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. We found a flight for you in UA airline with fare 100. Shall I make it confirm?

USER: Ok, please make it confirm.

ASSISTANT: Ok, your booking has been reserved with 1011 flight.

USER: Thank you.

ASSISTANT: Thanks a lot for choosing us.