You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Michelle Davis.

ASSISTANT: How may I help you today?

USER: Can you please change my reservation to new dates?

ASSISTANT: Michelle Davis, please wait for a moment till I check with availability for you.

USER: Sure, please take your time.

ASSISTANT: Sorry to inform you, there is no reservation under your name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for approaching our agency.