You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I want to attend my friend's marriage for that I reserved the ticket, but right now I am going by with other friends. So that I want change my reservation, can you help me to change my ticket?

ASSISTANT: Sure, I will help you with that. Please give me a moment.

USER: Sure.

ASSISTANT: May I know your good name for verification?

USER: I am Raymond Phillips.

ASSISTANT: Sorry Raymond, no reservation has found under your name to change the reservation.

USER: It's ok, no issues. Thanks for your help.

ASSISTANT: Thank you for reaching us. Have a good day.