You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jason Davis. I want to change my existing reservation, as my exams got postponed suddenly. Can you please help me with this?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your reservation details.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no reservation found on your name in my database.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your time.