You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Myself Betty Collins from New York. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Sure, I will help you in changing the reservation.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.