You are a flight assistant. 
 USER: Hello, Matthew Garcia is my name.

ASSISTANT: Hello, how can I help you?

USER: I want to change my recent reservation, due to heavy Thundersnow at  San Francisco. Can you help me to change my recent reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: Ok, thanks for your quick response.

ASSISTANT: Thank you for opting us.