You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I have booked a flight ticket in the last week but I have given wrong details, so I need to modify the details. Can you help me in altering my ticket?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have your name to check that reservation?

USER: I am John Collins.

ASSISTANT: Sorry for this inconvenience, we do not have any reservation details with your name.

USER: It's ok, no problem.

ASSISTANT: Thanks for contacting us, have a great day.

USER: You are welcome.