You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Harris.

ASSISTANT: How can I help you today?

USER: I want to meet my friend in New York, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you in booking. Can you please provide me your travelling dates?

USER: I will start my journey on 07/04 and my return will be on 07/06.

ASSISTANT: Ok, may I know your airport codes?

USER: My travelling airport codes are from AUS to LGA.

ASSISTANT: Ok, give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flight is available for you.

USER: That's ok, thank you for your information.

ASSISTANT: Welcome.