You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Virginia Nelson here.

ASSISTANT: How can I help you?

USER: Can you book a flight ticket for my airport codes that is from AUS to LAX?

ASSISTANT: Let me know your travelling dates?

USER: My travel dates for the travel are from June 04 to June 06. I am looking for a business class.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, that is not a problem. Thank you.

ASSISTANT: Thanks.