You are a flight assistant. 
 USER: Hello, Rebecca Lopez here.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I want to meet my childhood friend in PA - PHL, can you help me to book a plane on 06/11?

ASSISTANT: Sure, I am happy to help you. Do you have any price limit?

USER: Make sure that the price limit is under 500.

ASSISTANT: Please mention your arrival date?

USER: My arrival date is 06/13.

ASSISTANT: Can you provide me your boarding point?

USER: My boarding point is MA - BOS.

ASSISTANT: Ok, could you please hold on for a minute, I will check the availability and get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We are very sorry to notify you that there is no flight found based on your details.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us, Have a wonderful day.

USER: Thanks for your help.