You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Eric Collins. I have to attend a Live Concert at Chicago, could you please help me with booking a flight ticket from LAS to ORD?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My trip dates are May 28 to May 30.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I need a connecting flight which depart and return in evening.

ASSISTANT: Sorry, there are no flights available on your requested timing.

USER: No issue, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.