You are a flight assistant. 
 USER: Hi, Charles Campbell here.

ASSISTANT: Hi,. How shall I help you?

USER: I and my friends got a free passes for a Boat show at Denver, CO - DEN. So I want to attend the show. Can you help me in booking my ticket?

ASSISTANT: Surely. May I know your further travelling details?

USER: Sure, My source point is from Phoenix, AZ - PHX. I would like to fly out on 06/13 and return on 06/15.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry,we did not find any tickets matching your requirement. Thank you for reaching us.

USER: Ok, no issue. Thank you.