You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Janet Thomas. As my trip dates were postponed, I wanted to change my reservation, can you please help me in changing my reservation?

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: That's fine, thank you for checking.

ASSISTANT: You are welcome.