You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: I would like to change my existing reservation, due to postpone of my seminar. Can you please help me in changing?

ASSISTANT: Sure, may I know your name to go through the reservation status and get back to you.

USER: You can check the reservation with the name of Kathleen Allen.

ASSISTANT: Ok, please allow me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found active in our data base by the name you provided.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for approaching us.