Hello.
user
Hello, how may I help you at this moment?
assistant
I am Donna Moore. I would like to celebrate my birthday at Chicago, can you please help me to book a flight from DEN to ORD?
user
Sure, I will help you. Please send your travelling dates.
assistant
Sure, my travelling dates are 10 Oct and 12 Oct.
user
Do you have any requirements to be met? Sorry Donna Moore, there is no flight available on your travelling dates.
assistant
That's ok, thank you for your information.
user
You are welcome, have a nice day.
assistant