You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Ryan Moore. I reserved a flight ticket in june month with my name but I want to change my journey to july month. Can you help me?

ASSISTANT: Sure, I can help you with that. Sorry to say that there is no reservation found on your name in our database. May be the ticket is not correctly booked.

USER: Might be, I will check it once.

ASSISTANT: Yes.

USER: Thank you for your assistance.

ASSISTANT: You are most welcome.