You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today at this moment?

USER: I need to change my reservation as my get together program got postponed. Can you help me in changing the reservation made by name Benjamin Baker?

ASSISTANT: Please give me a moment.

USER: Sure, I will be waiting for your response.

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

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for opting us.