You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide service to you?

USER: I am Elizabeth Lopez, I am planning to attend a work shop at Oakland, help me in booking my flight ticket from Phoenix AZ-PHX to CA-OAK.

ASSISTANT: Sure, we are euphoric to help you. When are you planning to make your journey?

USER: My journey dates will be from 03/21 to 03/23.

ASSISTANT: Ok, please wait for a while.

USER: Sure. I need a direct flight.

ASSISTANT: Ok. Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Its ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.