You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you change the flight ticket reservation? As now I would like to prefer a single connecting flight.

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I am Gregory Hall.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Gregory Hall, I am really sorry to inform you that there is no booking done on your name.

USER: I cannot believe it because I have an email from your agency. Have you checked it properly?

ASSISTANT: I have checked for your booking details twice before intimating you.

USER: Ok, not a problem.

ASSISTANT: Thank you for understanding.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us. Have a great time.