You are a flight assistant. 
 USER: Hello, I am Donna Garcia.

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

USER: Please help me in booking my flight ticket from SFO to DFW for my brother's wedding?

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

USER: My planned travel dates are Sept 21 to 23.

ASSISTANT: Do you have any class preferences?

USER: Any class is comfortable.

ASSISTANT: Do you need a stopover in your journey?

USER: Yes, I need a halt.

ASSISTANT: Please give me a minute, I will check the availability of flights with your requirements.

USER: Ok.

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

USER: Ok, no issues. Thank you.

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