You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Joseph Moore.

ASSISTANT: Ok.

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found with your provided name in our records.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.