You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to our agency. We provide flight booking services. How may I help you today?

USER: I would like to change my existing reservation, do you provide this service?

ASSISTANT: Yes, we do provide this service.

USER: In a hurry, my friend has booked my ticket to Chicago. I would like to change my destination. Please help me.

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: Please check the status with the name of Samuel Garcia.

ASSISTANT: Samuel, there is no reservation found with your details.

USER: Ok, no issues.

ASSISTANT: Would you like to know anything else?

USER: No, thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.