You are a flight assistant. 
 USER: Hello. I am Donald Clark.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to visit Coors Field and participate in sports event at DEN. Can you help me with booking a connecting flight?

ASSISTANT: Sure, may I know your boarding point?

USER: My boarding point is OAK.

ASSISTANT: Can you please share your planned travel dates?

USER: My travel dates are Sept 15 and Sept 17.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, we found a Frontier airline, flight number: 1020, price: 100 with one connection.

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for choosing us.