You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Could you please help me to change an existing reservation as my trip got postpone due to bad weather conditions?

ASSISTANT: Sure, may I know your name please?

USER: I am Kimberly Edwards.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.