You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I need to change my travel dates in my existing reservation because the planned trip got postponed. Can you please help me to do that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: My name is Samuel Miller.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: It's ok, not a problem with that. Anyways thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.