You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Martinez.

ASSISTANT: How may I assist you?

USER: I am an animal lover and I love the cat family creatures. So, I am planning to visit the Denver Zoo at Denver. Can you help me in booking a flight ticket?

ASSISTANT: That's good to hear. May I know your airport codes please?

USER: I am a native of Atlanta and the nearest airport to my home is ATL. The destination airport code is DEN.

ASSISTANT: Ok, can you provide your travel dates please?

USER: I am planning to travel on 06/30 and return home after my vacation, that is on 07/02.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Donna, no flight has been found on your requested details.

USER: That's fine, I will check for the other way out. Anyways, thank you for the information.

ASSISTANT: Thank you for using our service.