You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Sharon Wright. Please help me in booking from OAK to LAS.

ASSISTANT: May I know the dates of your journey?

USER: My travelling dates are from Dec 17 to Dec 19.

ASSISTANT: Ok, please let me know the specification you planned.

USER: I want to return in the afternoon time.

ASSISTANT: Can I know your connection limits?

USER: I need a connecting flight.

ASSISTANT: Ok, please let me know your class preference.

USER: I am comfortable with any class.

ASSISTANT: Sorry, there are no flights available at your locations provided.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for choosing our agency.