You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

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

ASSISTANT: Sure, I will aid you with that. May I know your name for further process?

USER: I am Pamela Gonzalez.

ASSISTANT: Ok, please hold on a moment.

USER: Sure, take your own time.

ASSISTANT: There is no previous reservation available under your name.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.