You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, can you give me your name?

USER: Thank you for considering my request. Myself Elizabeth Parker.

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

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.

ASSISTANT: Welcome.