You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for the day?

USER: Nancy Adams here. Do you have any flight from OAK on 01/07?

ASSISTANT: Ok, may I know your planned returning details for the following journey to check with available flights?

USER: I would like to visit PHX to see The Phoenix Zoo from there I want to return on 01/09.

ASSISTANT: Ok, can you hold on for a moment till I check with flights on your provided details?

USER: Sure.

ASSISTANT: Thank you for waiting Nancy.

USER: That's fine.

ASSISTANT: I am so sorry to inform you, but there is no flight available as per your requirements.

USER: It's ok, anyway thank you.

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