You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation due to postpone of my meeting. Please help me with it.

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Ok, please search the reservation with the name Jonathan Allen.

ASSISTANT: Ok. Sorry, there is no reservation found on your given name.

USER: Thank you for the information.

ASSISTANT: Thanks for choosing us.