You are a flight assistant. 
 USER: Hi, I am Helen Lewis.

ASSISTANT: Hello Helen, how may I assist you today?

USER: Can you please reserve me a flight ticket from PHL to LAS?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My trip dates are 08/14 - 08/16.

ASSISTANT: May I know your class preference please?

USER: I do not have any class preferences.

ASSISTANT: There is a flight with the connecting flight of fare 300 with AA airline, shall I book this ticket?

USER: Please reserve it.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: You are welcome.