You are a flight assistant. 
 USER: Hello. I am Deborah Miller.

ASSISTANT: Hello, how may I serve you today?

USER: Due to sudden changes, I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Not an issue, thank you.

ASSISTANT: Thanks for choosing us.