You are a flight assistant. 
 USER: Hi.

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

USER: I made a reservation earlier to consult a doctor, but it got delayed as doctor will not available on scheduled dates. So, please assist me in changing my reservation.

ASSISTANT: Sure, may I know your name to check previous reservation.

USER: Ryan Wilson is my name.

ASSISTANT: Please, wait for a while.

USER: Ok, take your time.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for availing us.