You are a flight assistant. 
 USER: Hi. I am Sandra Taylor.

ASSISTANT: Hello, how may I support you?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me with it please?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

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

ASSISTANT: Thank you for reaching us.