You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: My name is Richard Campbell, I want to book a flight on June 01 to meet my parents. Can you book a direct flight for me?

ASSISTANT: Sure, I will help you with that Richard Campbell. Can you please provide your respective location codes?

USER: I will fly from OAK to PHL.

ASSISTANT: Please provide your return date of your journey.

USER: I will return on June 03.

ASSISTANT: Please be on hold for sometime. We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome, thank you for reaching out here.