You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: My name is Paul  Parker, I want to book ticket from Phoenix to Oakland.

ASSISTANT: I will aid you with that, may I know the dates you prefer for the journey you have planned?

USER: My preferable travel dates are 29 July and 31 July.

ASSISTANT: Ok, the details you have provided is noted in the portal. Please may I know the airport codes of the locations mentioned?

USER: I will travel from PHX to OAK.

ASSISTANT: Sorry, there are no flights available at your desired airport.

USER: No issues, I will find an other way to reach my destination,.

ASSISTANT: Thank you for choosing our agency, have a nice day.