You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: I need to change my reservation. Can you help me with changing?

ASSISTANT: Sure, I will help you to change your reservation. May I know your good name?

USER: Joseph Phillips is my name.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure, I will wait.

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

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.