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

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation, due to heavy rainfall, can you help me?

ASSISTANT: Ok, please wait I will check your reservation.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: That's ok, thank you for your information.

ASSISTANT: Most welcome.