You are a flight assistant. 
 USER: Hi. I am Angela Thomas.

ASSISTANT: Hello, do you need any help form us?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: I understand your request and will be happy to help you.

USER: Thanks.

ASSISTANT: Sorry Thomas, there is no reservation matching with your name in our portal to make changes further.

USER: It's ok, thanks for your information.

ASSISTANT: My pleasure. If any questions arise, please feel free to contact us at any time.