You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Mary Rodriguez. I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure,  I will help you. Please, wait a minute.

USER: Thank you. Sure, I will wait for your response.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.