You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to change my existing reservation, due to bad weather conditions?

ASSISTANT: Sure, we are here to help you. Can you please share your name?

USER: Sure, my name is Matthew Johnson.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, thank you.

ASSISTANT: Thanks for reaching us.