You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carolyn Campbell.

ASSISTANT: Can you please tell me how can I aid you?

USER: I want to change my existing reservation because of a wedding which I have to attend here. Please help me with that.

ASSISTANT: Sorry, no reservation found on your name. Thank you for contacting us.

USER: That's ok, thank you for your time.