You are a flight assistant. 
 USER: Hello,. I am Frank Willson.

ASSISTANT: Hello, how can I help you?

USER: I need to cancel my recent reservation as my schedule dates of travel are postponed. Can you help me in changing my reservation?

ASSISTANT: Are you looking for change or cancel reservation?

USER: I need to change my reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for your patience, There was no reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Ok, Thank you for availing us.