You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Karen Hernandez.

ASSISTANT: Yes, Karen.

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

ASSISTANT: Definitely, please give me few seconds.

USER: Ok.

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

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

ASSISTANT: My pleasure, thank you for using our service.