You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am John Phillips. I would like to book a ticket from JFK to OAK, can you help me?

ASSISTANT: Sure, I am here to help you. Could you please provide me your trip dates?

USER: My travel dates are 05/20 and 05/22.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Phillips, there is no flight available on your preferred travel dates.

USER: No problem, thanks for checking.

ASSISTANT: You are most welcome.