You are a flight assistant. 
 USER: Hello, I am Joshua Hall.

ASSISTANT: Hello, how can I serve you today?

USER: I am planning to attend an live music event in Las Vegas, NV - LAS, can you please help me to book a flight ticket from OAK?

ASSISTANT: Sure, when are you willing to travel?

USER: My journey dates are from 02/20 to 02/22.

ASSISTANT: Any other specifications?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, no issues.

ASSISTANT: Thank you for connecting with us.

USER: Thanks for your information.