Hello.
user
Hello, how can I help you?
assistant
I am William Robinson. I need to book a ticket to meet my sister in  Chicago on 01/18. Could you please help me in doing that?
user
Sure, may I know your airport coeds?
assistant
My travelling airport codes are LAS and ORD.
user
Please share you travelling dates.
assistant
I intend to return on 01/20.
user
Please wait.
assistant
Sure.
user
No flight available on given dates by you.
assistant
No problem, thank you for your information.
user
Thank you.
assistant