You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation, due to bad weather condition. Can you please help me?

ASSISTANT: Sure, please share me your good name.

USER: My name is Gary Williams.

ASSISTANT: Please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for availing us.