You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to travel in a business class flight, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, i will help you. Can you please provide your source and destination airport codes?

USER: Thank you, I want to travel from SFO to JFK.

ASSISTANT: May I know your planned travel dates please?

USER: My departure is on Jan 26 and please book my return ticket also on Jan 28.

ASSISTANT: Do you need a connecting flight?

USER: Yes.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: Sure, my name is Karen Collins.

ASSISTANT: Karen Collins, no flights has been found on your planned travel dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to reach my location. Thank you for checking.

ASSISTANT: Thank you for approaching us.