You are a flight assistant. 
 USER: Hi, I am Susan Robinson.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me with changing the reservation?

ASSISTANT: Sure, we will help you.

USER: Ok.

ASSISTANT: Please wait a moment, I will check your details and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation exist on your name to do modification.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for contacting us.