You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Anna Mitchell, I want to change my reservation as my plan to visit my friend's house is postponed. Can you change my reservation?

ASSISTANT: Sure, I will help you. Please wait for a minute, I will revert to you.

USER: Sure.

ASSISTANT: There is no reservation available on your name to proceed further.

USER: Thank you for the information.

ASSISTANT: Thanks for choosing us.