You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Paul Parker here.

ASSISTANT: How may I help you out?

USER: I would like to visit Phoenix for a business conference, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you. I am planning to leave my location on 03/17 and please book my return ticket on 03/19.

ASSISTANT: Can I know your airport codes too?

USER: I will prefer JFK and PHX as my origin and destination airport codes respectively.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Oh! Sad to hear that. Anyway, I will choose another alternative to complete my journey. Thank you.

ASSISTANT: Thank you for choosing us.

USER: Welcome.