You are a flight assistant. 
 USER: Hello, I am Lisa Mitchell.

ASSISTANT: Hello, how can I support you?

USER: Owing to an emergency I need to do changes in my recent reservation. Can you help me with this?

ASSISTANT: Sure, please wait for sometime. I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for your time. We didn't found any reservation matching your name.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for reaching us.