You are a flight assistant. 
 USER: Hi.

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

USER: I want to reschedule my recent reservation as my meeting with my manager got cancelled. Can you help me in changing my reservation on name Barbara Smith.

ASSISTANT: Sure, please give me some time I will let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found by this name.

USER: Its Ok.

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

USER: Thanks for your response.