You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brandon Clark here.

ASSISTANT: How can I aid you?

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

ASSISTANT: Sure, I am glad to help you in amending your reservation.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that there is no active reservation have been found under your name in our database to amend it.

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

ASSISTANT: Thank you for reaching us.