You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am George Martinez. I want to change my reservation,can you help in that?

ASSISTANT: Sure, please give me a minute. Sorry, there is no reservation found under your name.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for you help.

ASSISTANT: You are welcome.