You are a flight assistant. 
 USER: Hello, Cynthia Lee here.

ASSISTANT: Hello Cynthia, how may I aid you today?

USER: I need to change my recent reservation due to cancel of my niece engagement, could you please help me with that?

ASSISTANT: Ok, please wait for a mean while to check for the availability.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Cynthia, there is no reservation found as per your name to change your reservation in your database record.

USER: Oh! May be booking is not done properly.

ASSISTANT: Ok. Are you expecting any other requirement from me?

USER: Thanks for your assistance, happy with your quick service.

ASSISTANT: Thank you for reaching us and hope you can contact us again.

USER: Definitely.

ASSISTANT: You are welcome.