You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: When you are planning to travel?

USER: I have planned to travel on Jan 18 and 20.

ASSISTANT: Can you please help me with your airport codes?

USER: My airport codes are DEN and DFW.

ASSISTANT: Do you need any break in between journey?

USER: Yes, I need a break.

ASSISTANT: May I know the timings of travelling?

USER: I want to depart in the afternoon time and return in the evening time.

ASSISTANT: Please share me your good name.

USER: Sure, Karen Thomas here.

ASSISTANT: We are sorry to inform you that there is no flight found with your provided information.

USER: Thanks for the information.

ASSISTANT: Thank you for approaching us.