Hello, I am Timothy Walker.
user
Hello Mr. Walker, how may I help you ?
assistant
I just want to book a flight ticket from NV-LAS to CA-OAK.
user
OK. Can you tell me your travelling dates?
assistant
Sure, my depart and return dates are from 05/20 to 05/22.
user
Sorry Mr. Walker, no flights are available. Thank you to come here.
assistant