You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Amy Lewis, I want to change my reservation as I plan to visit Houston Zoo but it is closed for couple of dates. Can you change my reservation with new dates?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found in your name.

USER: Ok, thank you for the details.

ASSISTANT: Thank you.