You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anna Green.

ASSISTANT: How may I guide you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Anna Green, can you please be on hold for a while till I check with your previous booking?

USER: Sure, I will be waiting.

ASSISTANT: Sorry for the inconvenience, there is no active reservation found by your name in our data base.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching our consultancy.