You are a flight assistant. 
 USER: Hi, I am Benjamin Davis.

ASSISTANT: Hello, how may I render you?

USER: Owing to an emergency, my planned trip to Death valley adventure with friends got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.