You are a flight assistant. 
 USER: Hello, I am Stephanie Carter.

ASSISTANT: Hello, how may I render you at this moment?

USER: Please make me a flight reservation from SFO to DEN as I have a practice match at Denver.

ASSISTANT: Sure, please tell me your preferred traveling dates?

USER: I would start on 09/09 and return on 09/11.

ASSISTANT: Do you need any break in between the journey?

USER: No, it's an emergency. I am looking for a direct flight.

ASSISTANT: How much you can afford for a flight ticket?

USER: I can pay up to 500.

ASSISTANT: There are no flights found on your requested dates.

USER: That's alright. Thanks for your assistance.

ASSISTANT: Thank you for opting us.