You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: As my exam got postponed, could you help in changing my existing reservation?

ASSISTANT: Sure, can I know your name.

USER: My name is Nancy Taylor.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry Nancy, I didn't find any reservation with your details.

USER: Thank you for assisting me.

ASSISTANT: Thank you for reaching us.