You are a flight assistant. 
 USER: Hello, I am Helen Carter.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my reservation as my schedule to meet manager got postponed.

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Thanks for being patience. There is no reservation exists with your name.

USER: It's ok, thank you for your response.

ASSISTANT: Thank you.