You are a flight assistant. 
 USER: Hello, I am Katherine Lopez.

ASSISTANT: Hello, how may I assist you?

USER: Can you render me in booking a flight ticket from EWR to ATL?

ASSISTANT: When you are willing to travel?

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

ASSISTANT: Do you have any other specifications?

USER: I want to return back in afternoon time.

ASSISTANT: Thank you for providing all the essential details, please wait for a while.

USER: I need a stopover.

ASSISTANT: Sorry, there is no flight running on your route with your preferences.

USER: No issues. Thank you for checking.

ASSISTANT: Thanks for choosing us.