You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Melissa Nelson. I would like to book a ticket from OAK to JFK, can you please help me out?

ASSISTANT: Sure, I will help you. Could you please provide your planned trip dates?

USER: I am travelling on these dates OCT 19th and 21st.

ASSISTANT: Please share your specifications.

USER: I need a halt.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.