You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Thompson.

ASSISTANT: How can I help you?

USER: I want to book a flight from ORD to LAS. Can you please help me with this?

ASSISTANT: Please provide your travel dates.

USER: Sure, I want to depart on Sept 12 and need to return on Sept 14.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a connecting flight and my return time should be in the afternoon.

ASSISTANT: Sorry, I did not find any flights for you.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.