You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Emily Lee.

ASSISTANT: How can I help you?

USER: Due to some issues, I want to change my existing reservation. Can you please help me to change my reservation?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: I didn't found any active reservation under your name in our database.

USER: Not an issue, thank's for your information.

ASSISTANT: Thank you for approaching us.