You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Daniel Nelson, want to alter my recent reservation due to some changes in my plan. Please help me out with that.

ASSISTANT: Sure, may I know your name for checking?

USER: My name is Daniel Nelson.

ASSISTANT: As you have mentioned above, give me a minute.

USER: Sure.

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

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.