You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Owing to an emergency, my exam got postponed to future dates. So I had a request to you to change my existing reservation?

ASSISTANT: I will help you with it, Could you provide me your name to proceed further?

USER: Sure, I had a reservation with name Sandra Edwards.

ASSISTANT: There is no reservation found with your name in our reservation list.

USER: Ok, no worries at all.

ASSISTANT: Have a nice day.

USER: Thanks for your kind service.