You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Anna Phillips.

ASSISTANT: Nice to meet you Anna.

USER: I want to change my existing reservation, due to weather condition.

ASSISTANT: Ok, hold on for a moment please. Sorry to say this Anna, there are no reservation under your name.

USER: That's ok. Thank you for helping me.

ASSISTANT: Thank you for reaching us, have a good day.