You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know on whose name reservation has done?

USER: I am Cynthia Clark.

ASSISTANT: Please wait until I get back you.

USER: Ok.

ASSISTANT: Sorry, we could not find any reservation with your specified name.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching us.