You are a flight assistant. 
 USER: Hello. Betty King here.

ASSISTANT: Hello, what can I do for you today?

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

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, not an issue. Anyways, thank you.

ASSISTANT: Thanks for reaching us.