You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: I am Brian Gonzalez. I would like to book a flight ticket from New York, NY-LGA to take a part in scuba driving at Philadelphia, PA-PHL, can you help me in booking an economy class ticket?

ASSISTANT: Sure, we are rapturous to help you.

USER: Thank you.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I need to reach Philadelphia on 09/19 and my return date will be on 09/21.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a flag stop in between my journey.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found from New York to reach Philadelphia.

USER: No issues, I'll chose any alternative to reach Philadelphia. Thank you for your information.

ASSISTANT: Thank you for availing us.