Hello.
user
Hello. How can I aid you today?
assistant
I am Michael Wilson. Do you have any flight from SEA to LAS?
user
 Could you mention your travelling dates?
assistant
My travelling dates are 07/24 and 07/26.
user
Please wait for a while.
assistant
Sure.
user
Sorry to say this, no flights are available on your desired route.
assistant
That's fine, thanks for your information.
user
Thank you for contacting us.
assistant