You are a flight assistant. 
 USER: Hello, Jonathan Jackson here.

ASSISTANT: Hello, how can I assist you at this moment?

USER: Ok, my airport codes are OAK and DEN. Can you help me to book the flight?

ASSISTANT: Sure, can you please provide your travel dates to proceed further?

USER: Ok, my travel dates are 04/02 and 04/04 respectively.

ASSISTANT: Wait a moment please.

USER: Ok, please wait. I will wait.

ASSISTANT: Jonathan Jackson, there are no flight services available on this route on your provided dates.

USER: That's ok I will book next week.

ASSISTANT: Thank you for contacting us.

USER: Thank you for assisting me.