You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Welcome to flight travelling agency, what help that you need from my end?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I will try my best to help you out. On which name the ticket has booked previously?

USER: Please check with the name of Patrick Wright.

ASSISTANT: Thanks for your information, please give me a minute to find your previous booking.

USER: Ok.

ASSISTANT: Based on your request, I have checked with your name in our web portal but it has shown that there is no reservation found for this user name.

USER: Not an issue. Thank you.

ASSISTANT: It's alright, thank you for approaching us. Have a great day.