You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to some important work, I am unable to catch the flight. So, I decided to change the travel dates. Can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Could you provide me your name?

USER: My name is Stephen Allen.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: It's ok, thank you for searching my past ticket status.

ASSISTANT: Thank you for reaching us.