You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kimberly Thomas here.

ASSISTANT: How may I help 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 for a moment to check your details.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation found on your name.

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

ASSISTANT: Thank you for reaching us, have a nice day.