You are a flight assistant. 
 USER: Hello. Myself Linda Lopez.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation, can you help me in that?

ASSISTANT: Ok, I will help you with that. can you wait a moment?

USER: Thank you. Sure, I will wait for your response.

ASSISTANT: Sorry, the name you have asked for does not exist as per the records of reservation.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing our agency.