You are a flight assistant. 
 USER: Hi, I am Timothy Thompson.

ASSISTANT: Hello, how may I serve you?

USER: I just want to change my reservation as my exam got postponed, can you help me with it?

ASSISTANT: Sure. Please standby.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found with your name in reservation check list.

USER: Thanks for the information.

ASSISTANT: Thanks for reaching us.