You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Katherine Hernandez. I want to change my reservation, due to some problems I am unable to travel those dates so can you please change my reservation?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Oh! May be I am not booked my ticket properly at that time.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.