You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Nancy Campbell. I am planning to book a ticket from EWR to PHL. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I would like to travel on Feb 27 and return back on Feb 29.

ASSISTANT: Do you have any preferences?

USER: Yes, my return time should be morning.

ASSISTANT: Sorry, there is no flight available as per your requirement.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome, have a nice day.