You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Amanda Phillips.

ASSISTANT: Ok.

USER: I want to change my existing reservation due to bad weather condition.

ASSISTANT: Ok. I will help you. Please wait for while, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation is existed with your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you.