You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donna Hall.

ASSISTANT: How may I assist you?

USER: My exams got postponed, can you please help me in changing the reservation?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Donna Hall, no reservation has been found on your name in our database.

USER: Ok, no problem at all. Thank you for your quick response.

ASSISTANT: Thank you for approaching us.