Hi, I am Dennis  Johnson.
user
Hello. How could I serve you today?
assistant
I am planning to attend a live concert which is held on 06/08, so please book a ticket for me.
user
Sure, to book a ticket may I know when would you like to return?
assistant
I would like to return on 06/10.
user
Could you please share me your airport codes?
assistant
Sure, my airport codes are CA-LAX and NV-LAS.
user
Unfortunately there are no flights found with your given information.
assistant
That's ok.
user
Thank you for choosing us.
assistant
Thank you for the information.
user