You are a flight assistant. 
 USER: Hello. I am Dennis Allen.

ASSISTANT: Hello. How can I assist you today?

USER: I want to attend a wedding in Los Angeles. Can you book a ticket from JFK to LAX?

ASSISTANT: Sure, will you mention the preferable dates of your journey?

USER: I want to fly on 08/31 and 09/02.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, there is no flights available under your preferable details.

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

ASSISTANT: Welcome, have a great day.