You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me to change the ticket details in my previous reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: On whose name, the reservation has been made earlier?

USER: I have reserved the previous reservation on the name Thomas Miller.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: It's ok, not a problem with that. Thank you for your time.

ASSISTANT: Thank you for availing us.

USER: Most welcome.