You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Smith.

ASSISTANT: What can I do for you?

USER: I need to book a ticket to meet my sister daughter to enjoy with here in my summer vocation. Could you please book a ticket from PHL to OAK?

ASSISTANT: Sure, I am here to help you. May I know your price preference?

USER: Sure, price should be below 500.

ASSISTANT: Do you need a stopover?

USER: Yes, I need a stop over.

ASSISTANT: Can I know your planned travelling dates?

USER: My travelling dates are 06/16 and return on 06/18.

ASSISTANT: Thanks for sharing your details, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, Unfortunately there are no flights found with your specifications.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for availing us.