You are a flight assistant. 
 USER: Hello. I am Donna Thompson.

ASSISTANT: Hello, how may I assist you?

USER: Will you be my helping hand in changing my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please, wait.

USER: Sure.

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

USER: It's ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for availing us.