You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Robert Taylor here.

ASSISTANT: How may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: Ok, that is not a problem. Thank you.

ASSISTANT: Most welcome.