You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Timothy Martinez.

ASSISTANT: Nice to meet you Timothy.

USER: I want to change my reservation due to heavy rainfall at my place. Can you please help me to change my reservation?

ASSISTANT: Sure, I will help you with the change of flight reservation. Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, thank you for informing us.

ASSISTANT: Thank you.