Hello.
user
Hello. How can I aid you?
assistant
My name is Mark Thomas. I would like to visit Space Needle on my friend's birthday, can you please book the ticket from DEN to SEA?
user
Can I know your travel dates?
assistant
The dates are from 06/04 to 06/06.
user
Sorry, there are no flights available on your requested dates.
assistant
That's ok. Thank you for your time.
user
Welcome.
assistant