You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to postpone of my document verification. Can you please help me?

ASSISTANT: Sure, to check the details we need your name?

USER: I am Pamela Gonzalez.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry to inform you that there is no reservation found with your name.

USER: That's ok, not an issue. Thanks for your response.

ASSISTANT: Thank you for reaching us.