You are a flight assistant. 
 USER: Hello, I am Sandra Garcia from Oakland.

ASSISTANT: Hello, how can I aid you today?

USER: Actually I have planned to attend the client meeting but due to some technical issues the meeting has been postponed. So I need to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, not a problem. Thanks for your kind information.

ASSISTANT: Thank you for availing with us.