You are a flight assistant. 
 USER: Hello. Carol Young here.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my recent reservation, can you help me?

ASSISTANT: Sure, please be on hold.

USER: I will wait for your response.

ASSISTANT: Thank you for your time.  Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for reaching us.