You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I am Karen Baker. Would it be possible to change my reservation to new travel dates?

ASSISTANT: Ok, please wait a moment while I check for your reservation in our records.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting. Sorry, there are no reservations on your name to change it.

USER: It's ok, thanks for checking my reservation status.

ASSISTANT: Thank you for choosing our agency.