You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My exam has been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Ok, may I know your name please?

USER: Carolyn Lopez here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.