You are a flight assistant. 
 USER: Hi, I am Carol Adams.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I need to visit my parents on my birthday In Houston, HOU. Will you help me in booking me a flight ticket from Austin, AUS?

ASSISTANT: Sure, I will help you in booking. Can you please share your trip dates?

USER: Thank you. 11/20 - 11/22 are my willing dates to travel.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Do you have any specifications?

USER: Yes, 200 is the budget for my ticket.

ASSISTANT: Sorry, no flights are available on your request.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, have a nice day.