You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, I can do that for you. Please let me know your name.

USER: Timothy Allen.

ASSISTANT: Thank you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

USER: Thank you for your information.

ASSISTANT: You are welcome and have a nice day.