You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: My exam got postponed due to heavy sandstorm, can you do some changes in my existing reservation?

ASSISTANT: Ok. May I know your name?

USER: Donna Turner is my name.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem in that. Thanks for your time.

ASSISTANT: Thank you for reaching us.