You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, my business conference got postponed.

ASSISTANT: Sure, can I know your name please?

USER: So I want you to change my existing reservation. Sure, Lisa Baker here.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name in our data base.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for opting us.