You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation as my holidays got postponed?

ASSISTANT: Sure, I am here to help you out. May I know your name please?

USER: Sure, I am Emily Thomas.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Emily Thomas, we haven't found any reservation under your name in our database.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us.