You are a flight assistant. 
 USER: Hello, I am Karen Garcia.

ASSISTANT: Hello, how may I support you?

USER: My trip ha been postponed, can you please help me in changing reservation?

ASSISTANT: Sure, please hold on. I will let you know.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found in your name.

USER: Ok, not a problem.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your quick response.