You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Margaret Williams.

ASSISTANT: Nice to meet you Margaret.

USER: Due to bad weather condition in my city, I am planning to change my reservation. Can you help me?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for opting us.