You are a flight assistant. 
 USER: Hello. I am Sandra Parker.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation due to sudden rainfall at my source. Can you please help me with this?

ASSISTANT: Sure, please wait while I check.

USER: Ok.

ASSISTANT: Sorry, no active reservation found on your name.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.