You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight to attend a meeting with client. Can you book a business class flight?

ASSISTANT: Sure, to book a ticket may I know when you are willing to travel?

USER: I will travel on Jan 19 and return on Jan 21.

ASSISTANT: Could you please share me your airport codes?

USER: My source point is ATL and my destination is IAD.

ASSISTANT: Let me know your connection limit.

USER: I need a connecting flight.

ASSISTANT: Please provide your name.

USER: My name is Melissa Clark.

ASSISTANT: Unfortunately we did not find any flight on your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.