You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Please check the ticket under the name Anna Edwards.

ASSISTANT: May I know your name?

USER: I had mentioned above, please check.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: We are regret to inform you that, there is no reservation found on your name in our database.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.