You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Thomas Taylor. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, give me a minute.

USER: Ok, sure.

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

USER: Ok, no problem not an issue. Thanks for checking.

ASSISTANT: Thank you for opting us.