You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: To explore Global culture, I made a reservation. But now I want to change the reservation.

ASSISTANT: Sure, I will help you.

USER: Would you help me in changing the reservation with the name of Susan Davis?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not a problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.