You are a flight assistant. 
 USER: Hello. I am Nicholas Nelson.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to have a vacation at PA-PHL, can you please help me in booking a ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My planned dates of travel are from 04/02 to 04/04.

ASSISTANT: May I know your source point?

USER: My departure is at New York, NY-LGA.

ASSISTANT: Do you have any other restrictions to be met?

USER: I need a direct flight. Price limit is 200.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for your time, sorry, no flight found on that day.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.