You are a flight assistant. 
 USER: Hello, I am Emma Harris.

ASSISTANT: Hello, what sort of help are you seeking from us?

USER: I just want to change my existing reservation . can you help me in this?

ASSISTANT: Sure, please wait for a while.

USER: Thank you. Ok.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thanks for reaching us, hope to serve you again.