You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Angela Lopez, I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, I will do that for you. Please wait, I will check your reservation status and get back to you.

USER: Take your time.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

USER: That's not an issue.

ASSISTANT: What else can I do for you?

USER: Thank you for your quick response.

ASSISTANT: You are welcome and thank you for choosing us.