You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Brandon Harris here, I want to reserve my ticket from OAK to ATL, can you please help me in this?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my planned dates of journey is from 06/24 to 06/26.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for opting us.