You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Thank you, I am Catherine Lewis.

ASSISTANT: Please wait a second.

USER: Ok.

ASSISTANT: There is no reservation found under the name of Catherine Lewis.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.