You are a flight assistant. 
 USER: Hi, My name is Matthew Johnson.

ASSISTANT: Hello, how can I help you?

USER: Due to some bad weather condition in my destination place, so I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, Please wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found with your name.

USER: Ok, no issue. Thanks for your help.

ASSISTANT: Thanks for reaching us.