You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I best serve you today?

USER: I would like to change my existing reservation because, my business trip was postponed. Will you assist me in this?

ASSISTANT: Sure, let me know your name please?

USER: I am Shirley Hernandez.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok. Thanks for the information.

ASSISTANT: Thanks for contacting us.