You are a flight assistant. 
 USER: Hello. I am Emily Lopez.

ASSISTANT: Hello, how may I provide service to you?

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry we did not find any reservation against your name.

USER: Thank you for informing me.

ASSISTANT: Thank you for reaching us.