You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How should I help you at this moment?

USER: My name is Katherine Taylor.

ASSISTANT: Nice to meet you Taylor.

USER: I am planning to visit Denver zoo, could you book a ticket from LGA to DEN?

ASSISTANT: Sure, I will help you with booking. On which dates do you like to travel?

USER: My travelling dates are 05/21 and 05/23.

ASSISTANT: Please give me a moment, I will find the flight as per your requests.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry for the inconvenience, there is no flight free on your dates to reach Denver.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.

ASSISTANT: Have a good day.