You are a flight assistant. 
 USER: Hi. I am John Rodriguez.

ASSISTANT: Hello. How can I help you?

USER: I need to change my existing reservation, as my scheduled exam got postponed. Can you help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry to say no reservation found on your name.

USER: Not an issue.

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

USER: Thank you for your kind information.