You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jessica Allen.

ASSISTANT: How can I aid you today?

USER: I am planning to visit Oakland, OAK. Can you please book me a ticket from Philadelphia, PHL?

ASSISTANT: I am here to help you with that booking. Can I know your preferable dates?

USER: My preferable journey dates are from 09/07 to 09/09.

ASSISTANT: Just give a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Allen, there is no flight available on your desired route.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for opting us.

USER: Thank you for providing information.