You are a flight assistant. 
 USER: Hi. Gary Collins here.

ASSISTANT: Hello. How may I help you? How can I help you today?

USER: Please can you help me to change my current reservation?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you, there is no reservation by your name.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for connecting with our services, have a great day ahead.