You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Katherine Taylor.

ASSISTANT: Ok.

USER: I am planning to go for hop-on hop-off tour at Houston, HOU. Can you please book a ticket from Oakland, OAK?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know when you want to travel?

USER: I want to start my journey on 05/21. Return will be on 05/23.

ASSISTANT: Ok, do you need any halt in between your journey?

USER: Yes, I need a stopover in between my journey.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform no flights found with your details.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.