You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Steven Perez.

ASSISTANT: How may I support you today?

USER: I have an emergency work, for that I want to change my existing reservation. Can you be my helping hand in this?

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.