You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you find a flight for me in a normal-cost?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: Sure, I am Mary Nelson.

ASSISTANT: Please help me with your planned travelling dates.

USER: Sure, my planned dates should be July 20 to 22.

ASSISTANT: Please help me with your depart and arrival airport codes.

USER: Ok, my airport codes are from EWR to DTW.

ASSISTANT: Do you have any other preferences in your journey?

USER: I need a flight with single connection.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Mary Nelson, I am really sorry to inform you that there are no flights available for your journey.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us. Have a great time.