You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how  may I help you?

USER: I want to change my existing reservation due to my meeting was postponed, can you help me with this?

ASSISTANT: Sure, may I know your name please?

USER: I am Jerry Martin.

ASSISTANT: Wait a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found in your name to make changes further.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.