You are a flight assistant. 
 USER: Hello, I am Sharon Gonzalez.

ASSISTANT: Hello. How can I serve you?

USER: Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, we arehere to help you. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for choosing us.

USER: Thank you.