You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Christopher Smith. I want to attend my friend marriage at SEA , can you please book me a ticket from DFW?

ASSISTANT: Sure, may I know your planned trip dates?

USER: I have planned to travel on Apr-06th and return on Apr-08th.

ASSISTANT: Do you need any whistle stop in between journey?

USER: I need a halt.

ASSISTANT: Which class do you prefer either economy or business?

USER: I am ok with any class.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.