You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I made a reservation earlier to attend a meeting, but due to some technical issues the meeting got postponed. Can you please help me with changing my existing reservation?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: To check with your existing reservation, I need your good name please?

USER: Sure, my name is Stephen Adams.

ASSISTANT: Ok, please give a minute.

USER: Sure, take your time.

ASSISTANT: Thank you for your time, there is no existing reservation found on your good name in our data base.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.