You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patricia Jones here.

ASSISTANT: How can I assist you at this moment?

USER: Please assist me in ticket booking fro PHX to OAK.

ASSISTANT: Sure, can you please provide your travelling dates?

USER: My travelling dates are from 05/25 to 08/27.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Patricia Jones, there are no flights available on your provided dates.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: Thank you for contacting us.