You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been changed to some other dates..

ASSISTANT: Sure, please wait for a moment. Meanwhile, may I know your name?

USER: Sure, my name is Timothy Lopez.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.