You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I want to book a ticket from LAX to SFO to attend seminar, can you help me?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: I am departing on Jan 17 and return on Jan 19.

ASSISTANT: Ok, please let me know your good name to proceed further.

USER: My name is Cynthia Walker.

ASSISTANT: Do you prefer any specific class to travel?

USER: I prefer to travel in economy class.

ASSISTANT: Do you have any other specifications?

USER: I prefer a direct flight.

ASSISTANT: Sorry to inform you that no direct flight is available to you on your dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.