You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kimberly Walker here.

ASSISTANT: How can I aid you today?

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 that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please hold on a moment, I will check your reservation status.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available in your name Kimberly Walker.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: You are welcome.