You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

ASSISTANT: Sure, I am willing to help you for this. Can you please mention your name?

USER: My name is Sharon Carter.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to intimate that, no reservation is found with your credentials.

USER: No problem, thank you.

ASSISTANT: You are most welcome.