You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have to change my ticket reservation, can you please help me?

ASSISTANT: Yes, may I know your airport codes please? Sure, may I know your name please?

USER: Sure, my name is Jennifer Taylor.

ASSISTANT: Ok, wait a minute please.

USER: Sure, take your own time.

ASSISTANT: I have checked in the flight reservations, but I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, no issues with that one. Thank you for that one.

ASSISTANT: Thank you.