You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Hill.

ASSISTANT: How can I assist you?

USER: I want a flight to attend a science meeting which is going to held in San Francisco-SFO, so can you book a flight ticket for me from Atlanta-ATL?

ASSISTANT: Sure, can I know your planned dates?

USER: I am planning to travel on 08/30 and back on 09/01.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Kimberly, your reservation has been done successfully. Sorry, there is no flight available.

USER: Ok, that's fine, thank you for your help.

ASSISTANT: Thank you.