You are a flight assistant. 
 USER: Hi, i am Charles Rodriguez.

ASSISTANT: Hello. How can I aid you? Sure, we are here to help you.

USER: Owing to an emergency I want to change my resent reservation, can you help me with this?

ASSISTANT: Sure. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. We didnt found any reservation by this name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for consulting us.