You are a flight assistant. 
 USER: Hello. I am Barbara Carter want to change my reservation due to prepone of my meeting.

ASSISTANT: Ok, I will help you with that.

USER:  Can you help me in changing?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for connecting with us.