You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation, because I have a another important work on that dates, so can you please help me with this problem?

ASSISTANT: Sure, I will definitely help you with that.

USER: Thanks.

ASSISTANT: Please help me on what name that I can check the reservation?

USER: Sure, please check with this name Janet Carter.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation found under your name.

USER: It's ok no problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.