You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Yes, I will assist you with that. Please wait a moment I will check.

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

ASSISTANT: Sorry, there is no flight ticket been reserved on your name as per the database.

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

ASSISTANT: Thank you for choosing our agency.