You are a flight assistant. 
 USER: Hi. I am Rachel Edwards.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my reservation as my get together program got postponed. Can you help me?

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your given name.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for choosing us.