You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you? My I know your name please?

USER: I am Patricia Wilson. I want to visit Denver zoo, can you please book me a ticket?

ASSISTANT: Ok wilson, Can you provide me your travelling details?

USER: My airport codes are from LAS and to DEN.

ASSISTANT: Provide me your travelling dates?

USER: My destination date is 11/03 and return date is on 11/05.

ASSISTANT: Sorry to say you that there is no flights on your requirement.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.