Hello.
user
Hello, how can I guide you for today?
assistant
I am Donna Roberts. I am planning to book  a ticket to attend a marriage at PHL. Can you please help me out to book a ticket from ORD?
user
Can you please share on what dates you are willing to travel?
assistant
Sure, I would like to travel on Dec 12 and return back on Dec 14.
user
Do you have any class preferences?
assistant
No, I am ok with any class.
user
Please give me a minute, I will check the availability of flights on your requested route.
assistant
Sure, I will wait for your reply.
user
Sorry, there are no flights available on your requested dates.
assistant
That's fine, thank you for your service.
user
Thank you for contacting us, have a nice day.
assistant