You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to some technical issues. Can you help me with that?

ASSISTANT: Sure, may I know your name please?

USER: Sure, Daniel Jackson here.

ASSISTANT: I am sorry but we don't see any reservation on your name in our data base.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.