You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My name is Brian Johnson. I want to travel from JFK to LAX, can you please help me in booking a flight ticket?

ASSISTANT: Sure, can you share your journey dates?

USER: I will travel on May 20th and 22nd.

ASSISTANT: Do you have any preferences?

USER: I want to depart in the morning and return back in the afternoon.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.