You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Nichols Davis. My bank exams got postponed I need to change my existing reservation, Can you help me for change reservation please?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Thanks for your information.

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