You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Susan Davis, can you help me in changing my recent reservation?

ASSISTANT: Yes, will change if I find the reservation. Please wait a moment.

USER: Ok, I will wait.

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

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Thank you and have a nice day.