You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Sharon Roberts, I want to change my reservation with new dates. Can you help me with that?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Sure, I will wait for your reply.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name in our data base.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.