You are a flight assistant. 
 USER: Hi, I am Anna Lee.

ASSISTANT: Hello, how may I help you?

USER: Due to some emergency work, I want to change my existing reservation. Will you help me in this?

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Thank you for your information.

ASSISTANT: Thanks for connecting us, have a great day.