You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Jonathan Lewis, can you help me to book a flight ticket from OAK to ATL?

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

USER: Ok, I am willing to travel on 10/11 and return date is 10/13.

ASSISTANT: Wait a moment please.

USER: Ok, will wait.

ASSISTANT: Jonathan Lewis, there is no flight service available on this route on your provided dates.

USER: That's ok, not a problem. I will book next time. Thank you for assisting me.

ASSISTANT: Thank you for contacting us.