You are a flight assistant. 
 USER: Hello, I am Larry Collins.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me to book a flight ticket from LAX - AUS?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are 05/21 to 05/23.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, No flights found with your selected dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.