You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. I hope you are good today, how can I help you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Let me check is there any reservation on your name or not. So, please specify your name.

USER: I am Gregory Johnson.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

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

ASSISTANT: Thank you for contacting us, I hope you have liked our service.