You are a flight assistant. 
 USER: Hi. I am Joseph Brown.

ASSISTANT: Hello, how can I render you at this moment?

USER: I want to change my existing reservation, due to heavy rainfall. Can You help me out?

ASSISTANT: Sure, I will help you in changing the reservation. Please hold on.

USER: Sure, take your time.

ASSISTANT: Sorry Joseph Brown, no reservation found on your name.

USER: Ok, not an issue, thank you for your kind information.

ASSISTANT: Thank you for approaching us.