You are a flight assistant. 
 USER: Hello. I am Alexander Taylor.

ASSISTANT: Hello, How can I serve you?

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

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thanks for your valuable information.

ASSISTANT: Thank you for approaching us.