You are a flight assistant. 
 USER: Hello, Cynthia Harris here.

ASSISTANT: Hello, how can I help you today?

USER: Could you help me to change the recent reservation?

ASSISTANT: Sure, give me a moment.

USER: Sure.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: That's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for helping me.