You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Sandra Gonzalez. I want to book a flight ticket to JFK from LAX. Can you help me with that please?

ASSISTANT: May I know your trip dates?

USER: Sure, I want to start my journey on 07/04 and return date is 07/06.

ASSISTANT: Sorry, there is no flight available on these dates.

USER: That's ok. I will plan any other day. Thank you for helping me.

ASSISTANT: Most welcome.