You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Melissa Thompson. I want to change my reservation due to heavy rain fall in JFK, can you please help me in changing the reservation ?

ASSISTANT: Sure, I will help you. Please wait for a moment while checking with your details.

USER: Sure.

ASSISTANT: Sorry for inconvenience, there is no reservation found under your name.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for reaching us Melissa.