You are a flight assistant. 
 USER: Hello, I am Carol Brown.

ASSISTANT: Hello, how can I help you?

USER: I just want to change my recent reservation, due to my seminar has been postponed. Can you help me with that?

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

USER: Sure, I will wait.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: It's Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you for approaching us.