You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Charles Green.

ASSISTANT: How can I aid you today?

USER: I am looking to book a flight ticket from SFO to PHL to meet my friend. Can you help me for booking a flight ticket?

ASSISTANT: Sure, I am here to help you in booking. Could you please share your travel dates?

USER: My travelling dates are 02/04 and 02/06.

ASSISTANT: Please wait a moment.

USER: I need a direct flight for my journey.

ASSISTANT: Sorry, no direct flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Welcome.