You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Lisa Adams. I want to attend a seminar at New York, can you please help me to book my flight ticket from LAX to JFK?

ASSISTANT: Sure, please provide your travel dates.

USER: I have to depart on Nov 20th and also please book my return ticket on Nov 22nd.

ASSISTANT: Do you have any preferences?

USER: My depart time should be in the afternoon.

ASSISTANT: Sorry, we couldn't found any flights for you.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.