You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Due to some issues, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, can I know your name please?

USER: I am Rebecca Lee.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

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

USER: Oh! It may not be booked properly due to some technical issues while booking. Thank you for checking.

ASSISTANT: Thank you for approaching us.