You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Debra Turner.

ASSISTANT:  How can I assist you?

USER: I need to change my recent reservation, Can you please help me that?

ASSISTANT: Ok, please wait. Sorry, no reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.