You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation due heavy rain fall. Can you help me with that?

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

USER: My name is Andrew Martin.

ASSISTANT: Sorry to inform that there is no reservation done on your name.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for approaching us.