You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Please book me a flight ticket from SEA to DFW to meet my family.

ASSISTANT: Sure, we are pleased to serve you. May I know your travel dates?

USER: I have planned to travel on May 20th and return on 22nd.

ASSISTANT: Do you need any break in your journey?

USER: I prefer one connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am ok with any airline.

ASSISTANT: Do you have any class preference?

USER: No, thank's.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: For documentation, may I know your name please?

USER: Kimberly Evans.

ASSISTANT: Thank you for opting us, have a good day.