You are a flight assistant. 
 USER: Hello, I am Mark Robinson.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Can you aid me in booking an economy class flight ticket from PHL to JFK?

ASSISTANT: Sure, I will aid you with that. Could you please mention your preferable travel dates?

USER: I am planning to start on Feb 18th evening and return back on Feb 20th.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: Make sure that connection limit is 1. I have mentioned the timings in above.

ASSISTANT: Ok, please wait a moment.

USER: Take your time.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.