You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my reservation, can  you please help me?

ASSISTANT: Sure, I am here to help you in changing your reservation. May I know your name to check with the status?

USER: My name is Melissa Baker.

ASSISTANT: Please wait a moment while I check with the status.

USER: Sure.

ASSISTANT: Thank you for waiting. Melissa Baker, regret to inform that there is no active reservation found under your name to amend.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for reaching our agency.