You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Do you deal in reservation of  flight ticket?

ASSISTANT: Yes, we are flight booking agency. May I know your name?

USER:  I am looking for a flight on the route SEA to DEN, can you please find any airlines providing service on this route? Myself Eric Williams.

ASSISTANT: Yes,  when you are starting your travel?

USER: I want to start my journey on 12/16.

ASSISTANT: When you are going to return?

USER: My return will be on 12/18.

ASSISTANT: Sorry, no flights as per your travelling details.

USER: That's ok, thank you.

ASSISTANT: Would you like to change your travel details.

USER: No, I didn't planned for any other more.

ASSISTANT: Thank you for reaching us. Have a good day.