You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I am Steven Baker. I would like to book a flight ticket from New York to meet my father after a long time in Philadelphia. Could you please help me in booking?

ASSISTANT: Sure, can you please help me to share your travel dates?

USER: My journey dates are 12/20 and 12/22.

ASSISTANT: Please share your airport codes?

USER: My airport codes are from NY-EWR to PA-PHL.

ASSISTANT: Do you have any specifications?

USER: I need a halt. I can bare up to 5000.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no flight found on your given details.

USER: Ok, no worries at all. Thank you for your service.

ASSISTANT: Thanks for choosing us.