You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Frank Martinez want to visit Denver Zoo, can you book a ticket within the fare of 200?

ASSISTANT: Sure, I can help you with that. May I know your locations?

USER: Yes, I want to travel from OAK to DEN.

ASSISTANT: Ok, let me know your trip dates to find a flight for you.

USER: Sure, my travelling dates will be 10/05 and 10/07.

ASSISTANT: Thanks for your information, as per your details there is no flight for you.

USER: That's ok, thank you.

ASSISTANT: Ok, thanks for approaching us.