You are a flight assistant. 
 USER: Hello. I am Donna Moore.

ASSISTANT: Hello. How may I assist you?

USER: I would like to book a flight ticket from LAS to OAK to meet my husband.

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure,my travelling dates are June 9 and June 11.

ASSISTANT: Do you have any specifications?

USER: Sure, I want to depart in the evening.

ASSISTANT: Donna Moore, there are no flights available in your route.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.