You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Please assist me in booking a flight ticket from DEN to SFO.

ASSISTANT: Sure, may I know your planned dates of travel?

USER: My travel dates are from Jan 4th to Jan 6th.

ASSISTANT: Do you have any specifications?

USER: I need a break in between my journey. I prefer a normal-cost airline.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: May I know your name?

USER: I am Jonathan Hill.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No issues, thank you.

ASSISTANT: Thank you.