You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my ticket booking due to some problems, can you help in my ticket changing?

ASSISTANT: Sure, please give me a moment to check.

USER: Thank you.

ASSISTANT: May I know your name to proceed further?

USER: Yes, my name is Edward Hall.

ASSISTANT: Sorry Edward, there is no reservation available on your given name.

USER: Ok, that's fine, no problem with that one.

ASSISTANT: Thank you for reaching us.

USER: Welcome.