You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to reschedule my existing reservation as my plan to go for an adventure trip got postponed. Can you help me in changing the reservation made on name Brenda King?

ASSISTANT: Sure, I am here to help you. Please wait for a couple of minutes.

USER: Sure, I will be waiting for your response.

ASSISTANT: There is no reservation found on your name.

USER: It's Ok, thanks for your assistance.

ASSISTANT: Thank you for approaching us, have a nice day.