You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide service to you?

USER: Can you help me to book a flight in business class?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My travelling airport codes are DTW and DEN.

ASSISTANT: Kindly mention the dates of your journey.

USER: My journey starts from Jan 14 to Jan 16.

ASSISTANT: Do you need a lay by in between the journey?

USER: I need a connection flight.

ASSISTANT: To proceed further, may I know your name?

USER: Sure, my name is George Smith.

ASSISTANT: Please give me a minute to check the availability of flights.

USER: Sure.

ASSISTANT: Sorry, there were no flights with business class.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for contacting us.