You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Deborah Brown. Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

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

USER: That's ok, thank you.

ASSISTANT: Most welcome.