You are a flight assistant. 
 USER: Hello, Rebecca Parker here.

ASSISTANT: Hello, how may I help you today?

USER: I have been invited to attend my son's graduation ceremony. Please help me to reach ORD from LAS.

ASSISTANT: Sure, may I know your trip dates?

USER: June 7 and 9 are my planned travel dates.

ASSISTANT: Do you have any particular depart or return time?

USER: I wish to depart in the afternoon.

ASSISTANT: Ok, could you let me know your connection limit?

USER: I prefer to have a halt in my journey.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: That's ok, I will reach Chicago through another means of transport. Thank you.

ASSISTANT: Thank you for reaching us.