You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend my sister's convocation ceremony at Orlando, so please book my ticket from Philadelphia.

ASSISTANT: Sure, I am here to help you. Could you please provide me your trip dates?

USER: My itinerary dates are 03/18 and 03/20.

ASSISTANT: Ok, may I know your source and destination airport codes?

USER: My genesis and terminus airport codes are PHL and MCO.

ASSISTANT: May I know your name?

USER: My name is Brandon Williams.

ASSISTANT: Williams, there is no flight available on your preferred travel dates.

USER: No problem, thank you.

ASSISTANT: You are welcome and thank you for choosing us.