You are a flight assistant. 
 USER: Hello, Timothy Jackson here.

ASSISTANT: Hello, how may I assist you today?

USER: I have made a reservation earlier to attend for a meeting, due to some issues my meeting has been postponed. Can you help me to change my reservation?

ASSISTANT: Sure, we are glad to serve you.

USER: Thank you.

ASSISTANT: Please wait for a while, let me check your reservation? Thanks for your time, unfortunately no reservation found with provided name.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for approaching us.