You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kevin Williams here.

ASSISTANT: How could I aid you?

USER: Please help me out in booking the ticket from PHL to EWR.

ASSISTANT: Sure, may I know when you are planning to travel?

USER: My trip dates will be Mar 25 to Mar 27.

ASSISTANT: Do you need any other requirements?

USER: I want direct flight. My return time must be evening.

ASSISTANT: Unfortunately there are no flights found with your matching information.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.