You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: I am Linda Thompson. Actually, I didn't found the option of change reservation. Can you do this for me?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Sorry Linda, there is no reservation found on your name.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for approaching us, have a nice day.