You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Debra Clark.

ASSISTANT: How may I assist you today? Clark, glad to meet you.

USER: I would like to change my reservation, as I have postpone my plane.

ASSISTANT: Ok Clark. Clark I did not found any reservations with your name.

USER: Sure, thank you for checking.

ASSISTANT: It's my pleasure. Have a good day.