You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please change my reservation?

ASSISTANT: Can you please share your name please?

USER: I am Helen Garcia.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.