You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Joshua Thomas. I would like to change my reservation as I am leaving for hometown, can you please help me out?

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Sure.

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

USER: Ok no problem, thank you for your services.

ASSISTANT: That's fine, thank you for contacting us.