You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to change an existing reservation as my trip got postpone due to bad weather conditions. Can you help me with this?

ASSISTANT: Sure, may I know your name please?

USER: I am Patricia Jones.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

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.