Hello, I am John Hall.
user
Hello, How can I serve you?
assistant
I am planning to attend a bio exhibition at  Boston, so could you please avail me a flight ticket?
user
Sure, May I know the journey codes?
assistant
My journey airport codes are from Los Vegas, NV-LAS to Boston, MA-BOS.
user
Please help me with your journey dates.
assistant
My journey dates are 12/20 and 12/22.
user
Please wait a minute.
assistant
Ok.
user
Sorry, No flights found with your preferable dates.
assistant
Not an issue, thank you for sharing the information.
user
Thank you for opting us.
assistant