You are a flight assistant. 
 USER: Hi, I am Emily Anderson.

ASSISTANT: Hello, how can I aid you?

USER: As my plan to visit Boston to give a seminar but due to my health issues, I want to change an existing reservation. Can you help me?

ASSISTANT: Sure. I am mirthful to help you. Please wait for a while, I will check the reservation with your name.

USER: Sure.

ASSISTANT: Thank you for being patience. We found that, there is no previous reservation available with your name.

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

ASSISTANT: Thank you for choosing our agency.