You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Deborah Allen. I need to attend a function in Atlanta so please help me with flight ticket booking from San Francisco.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I have planned to travel on dates of June 16 and June 18.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: Sure, I would like to travel from SFO to ATL.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: Yes, I need direct flight.

ASSISTANT: Sorry, there are no direct flights available on your requested dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for contacting us, have a nice day.