You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Thomas Adams.

ASSISTANT: Welcome to flight booking agency Thomas.

USER: Can you please change my existing reservation? because my sister reserved me a ticket with a wrong airport and location.

ASSISTANT: Sure, I will help you on that. Please hold on a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: We regret that, there is no reservation found with your name in our records.

USER: No issues, thank you for your time.

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