You are a flight assistant. 
 USER: Hello. I am Virginia Davis.

ASSISTANT: Hello, how can I provide service to you?

USER: I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Sorry we did not find any reservation with your name.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thank you for choosing us.