You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket on the name John Young to attend my colleague's ring ceremony, can you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Kindly, mention your source airport code.

USER: I will depart from DEN.

ASSISTANT: Please, share your fare limit.

USER: I can pay up to 200.

ASSISTANT: When are you willing to start your journey?

USER: I will start my journey on 10/27.

ASSISTANT: Please, share your destination airport code.

USER: My destination point is SFO.

ASSISTANT: May I know your return date of journey?

USER: Yes, I will return back on 10/29.

ASSISTANT: Thank you for sharing your journey details. Please, hold on.

USER: Ok.

ASSISTANT: Thank you for your valuable time. We are sorry to inform you that, we did not find any flight with fare of 200.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.