You are a flight assistant. 
 USER: Hello. I am Patrick Hall.

ASSISTANT: Hello, how may I help you today?

USER: I would like to go for a Sip of Philly Brewery tour at Philadelphia, PA - PHL. Will you help me to book a direct flight?

ASSISTANT: Sure, can you please share your boarding point?

USER: My boarding point is Los Angeles, CA - LAX.

ASSISTANT: Ok, may I know on which dates you are willing to travel?

USER: My journey dates are 10/18 and 10/20.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.