You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you please assist me to change the travel details in my existing reservation?

ASSISTANT: May I know your name please?

USER: Thank you for your quick response. My name is Katherine Mitchell.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: It's ok, I think the ticket is not booked properly. Thank you for spending your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.