You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi, how can I help you?

USER: I have a conference in Orlando, can you book a ticket from Phoenix?

ASSISTANT: Sure, may I know the airport codes of starting and ending points of your journey?

USER: I will start my journey from PHX to MCO.

ASSISTANT: On which dates are you comfortable for travelling?

USER: My travel dates are 12/14 and 12/16.

ASSISTANT: May I know your name?

USER: Gregory Brown here.

ASSISTANT: No flights available on those dates, Brown.

USER: No problem, I will try for another alternative way. Thank you for your information.

ASSISTANT: Welcome, thank you for using our service.