You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have an event to attend during my planned journey dates. Can you help me in changing my existing reservation?

ASSISTANT: Please wait a while, let me check. May I know your name please?

USER: Please check with the name Debra Martinez.

ASSISTANT: There is no reservation on your name, Debra Martinez.

USER: Ok, I guess my friend has changed it on my behalf. Thank you for the information.

ASSISTANT: Thank you for reaching us.