You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation due to postpone of my client meeting, so can you help me with this?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Charles Robinson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no seat reserved for you in any flight.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.