You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Linda Young. I need to change an existing reservation. Can you help me in doing that?

ASSISTANT: Sure, let me check the reservation list and revert you.

USER: Ok , thank you.

ASSISTANT: Thanks for waiting, there is no reservation found in the database by the name you mentioned.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.