You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Myself Sarah Carter, can you help me to change my reservation which my brother had done recently?

ASSISTANT: Sure, please wait a moment I will check your details and proceed further.

USER: Ok, I will wait.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Ok, not a problem may be my brother had done the needful for me. Thank you for the information.

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