You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your good name please?

USER: I am Benjamin Walker.

ASSISTANT: How can I amend you?

USER: I want a flight with low fare of 500, as my existing reservation fare is 5000, can you help me to change my reservation?

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation with your provided name.

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

ASSISTANT: Thanks for approaching us.