You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: Due to heavy workload in my office, I need to change my reservation dates, can you please help me in that?

ASSISTANT: Sure, we will do it for you.

USER: Thanks for that.

ASSISTANT: I need your good name to check the existing reservation.

USER: My name is Sharon Lewis.

ASSISTANT: Please hold on.

USER: Sure, I'll be online.

ASSISTANT: Thank you for your time, there is no active reservation found with the given name.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you.