You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from SFO to LAX for my conference, can you please help me out with booking of a flight ticket between those locations?

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

USER: Thank you, my departure is on Sept 23 and please book my return ticket on Sept 25.

ASSISTANT: May I know your connection limit?

USER: Sure, I will prefer single connection.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I would like to departure in evening time.

ASSISTANT: Your good name please.

USER: Sure, my name is Karen Lopez.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.