You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dennis Miller.

ASSISTANT: Dennis Miller, How exactly I can serve you best today?

USER: You can serve me in booking a flight ticket to Atlanta, ATL under 500 fare.

ASSISTANT:  Sure, I can help you with our fully provided best services.

USER: Thank you.

ASSISTANT:  May I know, On which date you need to visit Atlanta, and return from there?

USER: I need to visit Atlanta on 10/27 and I want to catch return flight on 10/29.

ASSISTANT:  Ok, From which city airport you want to start your journey?

USER: I want to start from Austin, AUS.

ASSISTANT: How much fare you can spend, to reach your destination?

USER: I can spend up to 500 price to reach destination.

ASSISTANT: Ok, we did not find any flights below the fare 500. Instead of that, we found a flight with fare 600. Are you comfortable with that?

USER: I am not comfortable with that, I will try for other airline. Thanks for your kind response.

ASSISTANT:  That's ok, I will not proceed. Thanks for choosing us.