You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my planned dates, please help me in changing my existing reservation.

ASSISTANT: Sure, I will help you. Please wait, let me check your reservation status in our database. May I know your name?

USER: My name is Angela Hernandez.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome and thank you for reaching us.