You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Matthew Turner.

ASSISTANT: How may I aid you?

USER: 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 am glad to help you. Could you please share your trip dates?

USER: I would like to travel on Apr 20 and return back on Apr 22.

ASSISTANT: Do you have any specifications?

USER: Yes, my return time should be evening.

ASSISTANT: Sorry, there are no flights found on your trip dates.

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

ASSISTANT: Thank you for reaching us.