You are a flight assistant. 
 USER: Hello. Virginia Parker here,.

ASSISTANT: Hello, how can I help you today?

USER: My holiday trip has been postponed, so I would like to change my existing reservation. Could you help me in changing my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thanks for choosing us.