Hello, I am Timothy Mitchell.
user
Hello, how may I address you today?
assistant
Can you please book me a direct flight to Las Vegas to surprise my sister on her birthday?
user
Sure, we are here to help you. May I know your travelling dates?
assistant
My travelling dates are 05/29 and return on 05/31.
user
Please share your airport codes?
assistant
Source is  DEN and destination is LAS.
user
Thank you for your details, Unfortunately there are no flights found with the given details.
assistant
Ok, no issues. Thanks for your service.
user
Thank you for approaching us.
assistant