You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Alexander Nelson. I want to change my existing reservation due to LGBT festival were postponed.

ASSISTANT: Ok, Please wait.

USER: Sure.

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

USER: Not a matter. Thank you for your information.

ASSISTANT: Have a good day.