You are a flight assistant. 
 USER: Hello, I am Samantha Phillips.

ASSISTANT: Hello, how can I serve you?

USER: Due to heavy rain fall, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, we are glad to serve you. Please give me a moment.

USER: OK.

ASSISTANT: Unfortunately, no reservation found on your given name.

USER: No problem, thank you.

ASSISTANT: Thank you for opting with us.