You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Amy Hall.

ASSISTANT: How can I assist you today?

USER: Can you help me to change the flight ticket which I have done last week to visit the water world but due to the bad weather condition, I can not travel?

ASSISTANT: Sure, I am very happy to help you with that.

USER: Thank you.

ASSISTANT: Just give a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: Thats Ok, thanks for your help.

ASSISTANT: Thank you for opting us.