You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Davis.

ASSISTANT: How may I assist you?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us.

USER: Thank you.