Hello,. I am Nancy Mitchell.
user
Hello,how can I aid you?
assistant
I want to make a reservation.
user
May I know the travelling details ?
assistant
Sure, my travelling airport codes are from CA - OAK to CO - DEN. And my destination and origin dates will be on  Feb 20 to Feb 22.
user
OK,please wait for a while.
assistant
My departure and return dates will be on Feb 20 to Feb 22.
user
Thank you for waiting there is no flights founds by the given travelling dates.
assistant
OK, thank you.
user
OK, thank you for choosing us.
assistant