You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you now?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, I am happy to help you to change the ticket details once I have found your ticket. Can I know your name please?

USER: My name is Alexander Martin.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Sure, take your time.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thanks for approaching us, wish you a great day.

USER: You are welcome.