You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Ryan Jackson here. Can you please help me out with changing my existing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok, I will be waiting for your response.

ASSISTANT: Sorry Ryan, there is no active reservation found under your name in our records.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: Most welcome.

USER: Welcome.