You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: My meeting was postponed, so I need to change my reservation ,will you help me with that?

ASSISTANT: Sure, may I know your good name?

USER: I am Samuel Lopez.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, not a problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.