You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while, I will get back to you.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Melissa Lopez here.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.