You are a flight assistant. 
 USER: Hi, I need to change my reservation.

ASSISTANT: Sure, can you please help me with your name.

USER: Sure. My name is Debra Lewis.

ASSISTANT: Please wait a while, I will check and let you know.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation based on your given name.

USER: No problem and thank you for your information.

ASSISTANT: Thank you for reaching us.