You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven Lopez.

ASSISTANT: Steven Lopez, how may I assist you today?

USER: I am searching for a direct flight from Chicago, can you please help me to reserve a flight ticket to reach Charlotte?

ASSISTANT: Sure, I will help you. Please let me know with your planned travel dates.

USER: Thank you. My planned journey dates are July 13 and July 15.

ASSISTANT: Please help me with your source code.

USER: The source airport code is ORD.

ASSISTANT: Steven Lopez, I regret to inform you that there no direct flights from Chicago and Charlotte.

USER: It's ok, not a problem with that.

ASSISTANT: Thank you for understanding.

USER: I will choose some other source to travel. Anyways thank you for your time.

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