You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need your help in changing my travel dates in my existing reservation so can you please help me with that?

ASSISTANT: Sure, may I know your good name please?

USER: Thank you for your response, my name is Catherine Garcia.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

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

ASSISTANT: Thank you for choosing us.