You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to some personal problems, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: My name is Emma Moore.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data to change it.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for visiting us.