You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be of your help?

USER: As my tour to Brooklyn Walking has been postponed. Help me in changing my resent reservation.

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

USER: I am Karen Anderson.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Unfortunately there is no reservation found with your name.

USER: No problem. Thank you for your quick response.

ASSISTANT: Thank you for reaching us.