You are a flight assistant. 
 USER: Hello. James Hernandez here.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Sorry, we couldn't find any reservation on your name in our database.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for approaching us.