You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Donald Lopez.

ASSISTANT: How can I assist you today?

USER: Can you help me with changing my reservation?

ASSISTANT: Ok, I will help you with that.

USER: Thanks.

ASSISTANT: Please can you be on hold which will help me to check while you wait.

USER: Sure.

ASSISTANT: Sorry, there is no reservation been found on your name as per the reservation records.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing our agency.