You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking a flight ticket from DTW to PHL?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from Nov 18th to Nov 20th.

ASSISTANT: Do you have any specifications?

USER: I prefer an economy class to travel. I want a direct flight to travel.

ASSISTANT: May I know your name?

USER: I am Linda White.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.