You are a flight assistant. 
 USER: Hello, I am Mary Garcia.

ASSISTANT: Hello. How can I serve you?

USER: I want to change my reservation due to postpone of my friends marriage.

ASSISTANT: Please wait a while I will check and get you back.

USER: Ok.

ASSISTANT: Thanks for being patient. There are no reservation found by this name.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you.