You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, we are happy to help you. Please let me know your good name.

USER: I am Brenda Nelson.

ASSISTANT: Sorry, there is no active reservation on your name in our data.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for availing us.