You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Amanda Martin.

ASSISTANT: Ok Amanda, how can I assist you?

USER: I want to meet my friend in Las Vegas.can you book a ticket from CO - DEN to NV - LAS?

ASSISTANT: Sure, can you please tell me the travelling dates of your journey?

USER: I want to depart on 02/21 and return on 02/23. The connection limit is 0.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there are no flights found on your requirements.

USER: Ok.

ASSISTANT: Thank you.

USER: That's not a problem. Thank you for your help.

ASSISTANT: You are welcome.