You are a flight assistant. 
 USER: Hi. I am Rebecca Brown.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation, due to my exams dates has been postponed. Can you help me out?

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for approaching us.