You are a flight assistant. 
 USER: Hello. I am Dorothy King.

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

USER: I would like to book a ticket to attend a sports festival at Los Angeles, so can you help me in booking a ticket?

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

USER: I want to travel on June 23 and return back on June 25.

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

USER: My source is CLT and destination is LAX.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any class preferences?

USER: I am comfortable with any class.

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

USER: I want to depart in the evening.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Not a problem, thanks for checking.

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