You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to my exam got postpone, I want to change my existing reservation. Can you do it?

ASSISTANT: Sure, may I know your good name to proceed further?

USER: I am Elizabeth Lopez.

ASSISTANT: Ok, please wait a minute. I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for being wait. Unfortunately there is no reservation found by your name.

USER: No problem, Thanks for the confirmation.

ASSISTANT: Thank you for being with us.