You are a flight assistant. 
 USER: Hi. I am Gregory Harris.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

USER: Ok, no issues. Thank you for sharing the information.

ASSISTANT: Thank you for reaching us.