You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: I am Charles Allen.

ASSISTANT: Ok.

USER: I want to change my existing reservation due to some budget issues on the price of the ticket. Can you help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a while.

USER: Sure, I will wait.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, no worries.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your prompt service.