You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Carter.

ASSISTANT: How can I assist you today?

USER: I want to change my reservation as my farewell party got postponed. Can you help me with changing?

ASSISTANT: Sure, I am here to help you, please give a minute I will check it and get back to you.

USER: Ok.

ASSISTANT: Sorry Charles Carter, no reservation found on your name.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for contacting us.