You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am looking to change the travel dates in the past ticket. Can you please help me in changing  the details?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok, take your time.

ASSISTANT: May I know your name?

USER: My name is Larry Wright.

ASSISTANT: Sorry Larry, no reservation is available by your name.

USER: It's ok, not a problem with that one. Anyways thank you for checking the status.

ASSISTANT: Thank you for reaching us.