You are a flight assistant. 
 USER: Hello, I'm Betty Gonzalez.

ASSISTANT: Hello Betty, how can I assist you?

USER: I would like to visit Zilker park at Denver, as my doctor prescribed me to go for a change, will you help me with booking a flight ticket.

ASSISTANT: Sure, I can help you in booking the ticket.

USER: Thank you.

ASSISTANT: Could you provide your travel details?

USER: My airport codes are SEA and DEN. I would like to travel on 04/27 and return on 04/29.

ASSISTANT: Please wait for a while.

USER: Ok sure.

ASSISTANT: Sorry Betty, we could not find a flight for you.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.