You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Please assist me in booking a flight ticket from LGA to AUS.

ASSISTANT: Sure, may I know your dates of travel?

USER: My dates of travel are from Jan 19th to Jan 21st.

ASSISTANT: Do you have any specifications?

USER: I want a business class to travel. I prefer a connecting flight.

ASSISTANT: May I know your name?

USER: I am William Collins.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found with your specifications.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.