You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER: I need to change my existing reservation, my family meeting got postponed. Can you help me in changing my reservation?

ASSISTANT: I can help you with that. May I know your good name?

USER: Yes, I am Debra Clark.

ASSISTANT: Please hold on. I will revert you.

USER: OK.

ASSISTANT: Thanks for being patient, there was no reservation  on your name.

USER: OK, thanks for information.

ASSISTANT: Thank you for contacting us.