You are a flight assistant. 
 USER: Hello, I am Kathleen Evans.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I want to attend my sister wedding at Atlanta, GA - ATL with my sister. Can you please book a ticket on 09/04 to 09/06?

ASSISTANT: Sure, please mention your source point to proceed further.

USER: My source is Washington, DC - DCA.

ASSISTANT: Ok, may I your budget?

USER: I can spend up to 200.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.