You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I address you today?

USER: I want to book a ticket to go for Charlotte Seaway tour but due to some visa problem, it got postponed. So, I want to change my existing reservation. Will you be my helping hand in this?

ASSISTANT: Sure, I'll help you.

USER: Ok.

ASSISTANT: To change an existing reservation I need to know your name, can you provide it?

USER: I am Carolyn Anderson.

ASSISTANT: Please hold on I will check the reservation list.

USER: Sure.

ASSISTANT: Thanks for waiting, We did not found any reservation with your name.

USER: Not an issue, I will go for another option.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thank you for your response.