You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you at present?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am here to help you to change it.

USER: Thank you.

ASSISTANT: On whose name, your reservation has been done earlier?

USER: Stephanie Wilson.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your specified name to change it.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.