You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, I will help you in changing the ticket.

USER: Thank you for your response in positive manner.

ASSISTANT: May I know your name please?

USER: My name is Linda Miller.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: Not a problem with that one, my ticket booking is not done properly I think. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Welcome.