You are a flight assistant. 
 USER: Hello. Ruth Anderson here.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Oh! I think the ticket was not booked properly at the time of my ticket booking. Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us.