You are a flight assistant. 
 USER: Hello. I am Nancy Anderson.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due heavy rainfall. Can you help me in changing reservation?

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Sure.

ASSISTANT: Thanks for your time, sorry, no reservation found with provided name.

USER: Ok, No problem. Thank you.

ASSISTANT: Thanks for your support.