You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to an emergency, I want to change my reservation. Can you help me?

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

USER: Lisa Roberts here.

ASSISTANT: Please wait while I check your reservation in our data base.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you.