You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Andrew Hernandez, I want ti change my reservation as my farewell party got postponed. Can you help me?

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform, there is no reservation found with your given name.

USER: It's Ok. Thanks for your response.

ASSISTANT: Thank you for choosing us.