You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you.

USER: I want to change my reservation as I can no longer travel on my planned travel dates, can you please help me with that?

ASSISTANT: May I know your name?

USER: Sure, I am Michelle Smith.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: That's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your fast service.