You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Timothy Moore. I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Thank you.

ASSISTANT:  Thank you for reaching us.