You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sarah Miller here.

ASSISTANT: How can I assist you today?

USER: I need to change my existing reservation due to bad weather conditions. Can you please help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Ok, thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: I appreciate your patience. Sorry to inform you that, here there is no reservation found under your name in our database.

USER: That's ok, no problem. Anyway thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.