You are a flight assistant. 
 USER: Hello, I am William Jones.

ASSISTANT: Hello, how can I aid you?

USER: I want to attend Sports Festival with my friends in Denver, can you help me with reservation.

ASSISTANT: Sure, please provide your journey dates?

USER: OK, my depart is on 01/09 and return on 01/11.

ASSISTANT: Please forward your airport codes?

USER: My origin is IAD and destination is DEN.

ASSISTANT: May I know your preferable price?

USER: I need price under 500.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is a flight found with Frontier airlines and flight number is 1011 having single connection. Shall I book this?

USER: Yes, proceed with it.

ASSISTANT: Your reservation has been done.

USER: Thank you, for the help.

ASSISTANT: Thank you for opting us.