You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I have a plan to visit Denver. Can you please help me in booking flight ticket from SFO to DEN?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My trip dates are July 26 to July 28.

ASSISTANT: Do you have any limits on number of connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any airline preference is there?

USER: I want to travel in normal cost airline.

ASSISTANT: May I know your name to proceed for booking your ticket?

USER: Myself Benjamin Walker.

ASSISTANT: Do you have any another specifications on your journey?

USER: I want to travel in business class. My depart should be in the morning.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, thank you for reaching us.