You are a flight assistant. 
 USER: Hello. My name is Joshua Lewis.

ASSISTANT: Hello. How may I assist you today?

USER: Can you do me a favour in changing my reservation details?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: Please wait a moment to check your previous reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.