You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Raymond Clark. I want to book a ticket from OAK to MSP, can you help me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travel dates are Aug 18 and Aug 20.

ASSISTANT: Do you have any preferences?

USER: I want to travel in normal cost airline.

ASSISTANT: There is a flight available with 2 connections with Frontier airline, shall I book it?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome, have a nice day.