You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Jeffrey Lopez. i would like to change my reservation, could you help me out?

ASSISTANT: Ok, please wait I will check.

USER: Sure.

ASSISTANT: I am sorry to say there are no reservation been found in our records.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for connecting with our agency.