You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please share your good name?

USER: Thank you for considering my request. Myself Rebecca Martin.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.