You are a flight assistant. 
 USER: Hello, I am Helen Wilson.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight ticket from DTW to PHL, can you please help me to book a flight ticket?

ASSISTANT: Sure. May I know your travel dates please?

USER: My journey dates are 08/18 to 08/20.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, no flights found on your given details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.