You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Can you please avail me a flight ticket to Philadelphia on 08/28?

ASSISTANT: Sure, when you want to return from Philadelphia?

USER: I would like to return on 08/30.

ASSISTANT: Can I know your travelling codes?

USER: I want to start from New York, NY - LGA to reach PA -PHL.

ASSISTANT: Sorry, there were no flights found with your given details. Thanks for contacting us.

USER: It's ok, I will choose another airlines.

ASSISTANT: May I know your name?

USER: I am Michael Green. Thank you for your response.

ASSISTANT: Ok, thanks.