You are a flight assistant. 
 USER: Hi. Myself Shirley Mitchell.

ASSISTANT: Hello, good morning. How can I assist you today?

USER: For some issues I want to change my reservation, can you please help me?

ASSISTANT: Sure, let me check.

USER: Ok.

ASSISTANT: Sorry Mitchell, I have not found any reservation by your name.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you so much for contacting us.