You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Mitchell.

ASSISTANT: Donna Mitchell, how can I assist you for the day?

USER: There is an emergency case which came to hearing on the dates which I have planned to enjoy in my holidays in my home town, so I am unable to travel the trip due to this one. Can you please help me in changing my flight ticket?

ASSISTANT: Sure, I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: Please hold for a momrnt.

USER: Sure, I will wait.

ASSISTANT: Sorry to tell you, there is no reservation found with your name in our reservation list.

USER: Ok, that's fine. Thank you for providing your information.

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

USER: Welcome.