You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Frank Johnson.

ASSISTANT: How may I help you today?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Ok, give me a moment to check with your existing reservation.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation was found by your name.

USER: Ok,  no issues. Thank you for checking. Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing our services.

USER: You are welcome.