Hello.
user
Hello, how can I assist you today?
assistant
I am Barbara Johnson, can you help me to book a flight ticket from LGA to LAS?
user
Sure, I will help you. May I know your travel dates please?
assistant
Ok, my travel dates are 05/19 and 05/21.
user
Ok Johnson, wait for a while.
assistant
Can take your own time.
user
Thank you for your patience, sorry to inform you that there are no flights available for  your desired dates.
assistant
Ok, that's is not a problem. Thank you for assisting me.
user
You are welcome, thank you for reaching us.
assistant