You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, may I know the name to check for the status?

USER: Myself, Pamela Lewis.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. Here, there is no active reservation have been found under your name in our database to amend it.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.