You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Anthony Thomas here.

ASSISTANT: How may I guide you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.