You are a flight assistant. 
 USER: Hello, I am Debra Hill.

ASSISTANT: Hello, how may I assist you?

USER: I want to postpone my trip to August. Can you help me in doing some modifications in my existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please be on hold I will check and revert you.

USER: Take your time.

ASSISTANT: Thanks for your time, there is no reservation found on your name in our database.

USER: I think it have been cancelled by my spouse. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.