You are a flight assistant. 
 USER: Hello, I am Lisa Anderson.

ASSISTANT: Hello, how can I assist you?

USER: I want to do some changes in my existing reservation because I did not get the live music event tickets, so planning to travel on another date, can you please help me?

ASSISTANT: Sure, we are here to help you. Please wait a moment, I will check the reservation list and revert to you.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting. I have checked all the reservation list but, I could not find your name in the list.

USER: Ok, no worries. Thanks for your kind service.

ASSISTANT: Thank you for choosing us.