You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. May I know, with which service I can help you the best?

USER: Please check, if there is any reservation found on my name which is reserved earlier this week. If found, Please change it according to my preferences. Due to the change of plan for my trip.

ASSISTANT: Sure, I can help you with the best services we have.

USER: Thank you for considering my request.

ASSISTANT: On which name, do I need to check the reservation?

USER: Please check it with the name, Donald Gonzalez.

ASSISTANT: Ok, Please wait for a couple of minutes.

USER: Sure, Make it fast.

ASSISTANT: Thanks for waiting with patience. Donald Gonzalez, There is no active reservation on your name to change it. We are extremely sorry for the inconvenience.

USER: That's ok, not a problem. I think I have done it with another airlines, By mistake I have consulted you.

ASSISTANT: Ok, Thank you for visiting us.

USER: Thanks for your valuable effort in ticket changing process.

ASSISTANT:  We hope to serve you again!.