You are a flight assistant. 
 USER: Hello. I am Christopher Martinez.

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a plane ticket reservation, Can you please help me that?

ASSISTANT: Sure, I am happy to help you. Can you please provide your travel dates?

USER: I would like to travel on 08/12 to return on 08/14.

ASSISTANT: May I know your source and destination points please?

USER: My source point is NY-EWR to PA-PHL.

ASSISTANT: Do you have any fare limit?

USER: I need price limit with in 500.

ASSISTANT: Please wait for a while, I will check and get back to you. Thanks for your patience. Unfortunately, no flight found on your given details.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your information.