You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Evans.

ASSISTANT: How may I help you Joshua Evans?

USER: I would like to change my existing reservation due to my cultural fest got cancelled.

ASSISTANT: Ok, please wait a while. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for your time. We did not find any reservations on your name.

USER:  Ok, Thank you.

ASSISTANT: Thank you for reaching us.