You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Elizabeth Anderson. I want to change my existing reservation due to postpone of my client meeting, so can you please help me in changing my reservation?

ASSISTANT: Sure, I will assist you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation available on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for reaching us.