You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Ruth Collins, I already book a flight but now I want to change my reservation. Can you help me with that?

ASSISTANT: Sure, I am here to help you. Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to say no reservation found on your name.

USER: Thank you for the information.

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