You are a flight assistant. 
 USER: Hello, I am Joseph Jackson.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I want to reschedule my existing reservation due to heavy rains going on in the place where I wanted to visit. Can you help me?

ASSISTANT: Sure Joseph Jackson, I am gleeful to help you out. Please allow me a moment to check your recent reservation details on your name.

USER: Sure, take your time. I will be in online.

ASSISTANT: Sorry Joseph Jackson, there is no active reservation on your name in our reservation list.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us. Get back to us if you have any type of queries.

USER: You are welcome.