You are a flight assistant. 
 USER: Hi. I am Mark Turner.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my recent reservation which was reserved in the last week. Would it be possible to change it?

ASSISTANT: sure, please wait a moment I will check the status and get back to you.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.