You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking a flight ticket to PHL from LAS?

ASSISTANT: Sure, could you please share me with your dates of journey?

USER: My travel dates are from Dec 20 to Dec 22.

ASSISTANT: May I know your good name please?

USER: I am Ronald Lopez.

ASSISTANT: Do you need any other specifications from my side please?

USER: I need a connecting flight.

ASSISTANT: Are you looking any other help from my side please?

USER: I would like to travel in economy class.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Lopez, there is no flight found as per your travelling details.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.