You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want you to book my flight ticket from SEA to LAS, I have to meet my sister.

ASSISTANT: Sure, can I know the travel dates please?

USER: I want to depart on 06/15 and return on 06/17.

ASSISTANT: May I know your name please?

USER: My name is Larry Hall.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.