You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I made a reservation earlier to visit Denver but now I want  my return flight in the morning time. Can you help me in changing my reservation?

ASSISTANT: Sure, I am gleeful to help you with that.

USER: Thank you.

ASSISTANT: Please share your name to check your previous reservation.

USER: Sure, Benjamin Wright here.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching us, hope you have a great day.