You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, firstly may I know your name?

USER: My name is Ashley Wright.

ASSISTANT: Yes, Wright which type of services you are looking from us?

USER: I am very happy to change my existing reservation because my examination was postponed. Please help me in changing my previous reservation.

ASSISTANT: Sure, I will help you to change your reservation.Please, give me a moment to check the existing reservation.

USER: Sure.

ASSISTANT: Yes, Wright I do not find any reservation under your name to change.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: You are welcome, hope you have a great day ahead.