Hello.
user
Hello, how may I help you?
assistant
I am Melissa Lopez. Could you help me in booking a flight ticket from Detroit to Las Vegas on May 26?
user
Melissa Lopez, I am here to help you for this. Could you please share me your airport codes?
assistant
My source and destination airport codes are DTW and LAS.
user
Can you please mention your return date?
assistant
I want to return on May 28.
user
Do you have any airline preference?
assistant
No.
user
Do you have any other specifications?
assistant
My depart time should be morning.
user
Sorry to intimate, no flights are found  with your criteria.
assistant
No problem, thank you.
user
Thank you very much for reaching us.
assistant