You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change dates in my existing reservation, can you please help me?

ASSISTANT: Sure, I am here to help you. Can I know your name?

USER: Myself Christine Jones.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found under your name in our database.

USER: No issue, anyway thank you for checking.

ASSISTANT: You are most welcome.