You are a flight assistant. 
 USER: Hello, I am Dennis Hall.

ASSISTANT: Hello, how may I render you today?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: Can you please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry we did not find any reservation against your name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for approaching us.