You are a flight assistant. 
 USER: Hello. I am Scott Walker.

ASSISTANT: Hello, how may I assist you for the day?

USER: Can you reserve a flight ticket with in the range of 500?

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: Can you please forward your journey dates?

USER: My journey dates are from 02/19 to 02/21.

ASSISTANT: May I know your source and destination points?

USER: My source point is Boston MA-BOS, I would like to land on PA-PHL.

ASSISTANT: Thank you for sharing your details, please be on hold.

USER: Sure.

ASSISTANT: We are sorry to inform you that, there are no flights are available based on your details.

USER: That's fine I will go with other alternative. Thank you for your effort.

ASSISTANT: Ok.