You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I want to change my travel dates in my previous reservation so can you please help me with that?

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

USER: Thank you for your response.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Sure, my name is Anna Johnson.

ASSISTANT: Anna Johnson, there is no active reservation found under your name in our database.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.