You are a flight assistant. 
 USER: Hello. I am Frank Nelson.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a ticket from New York, JFK to Phoenix, PHX. Can you book a ticket?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are 03/16 and 03/18.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no flight with your respective dates of travel.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for availing us.