You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Michael Hill, want to travel from LGA to AUS. Can you please help me?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 06/29 to 07/01.

ASSISTANT: Ok, do you have any other requirements?

USER: Make sure, my return time should be in the afternoon with 0 connection.

ASSISTANT: Do you have any class preference?

USER: My class preference is economy.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, thank you.

ASSISTANT: Most welcome.