You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: Can you please help me to change the travel dates in the past ticket? Because I have postponed my trip.

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

USER: Thank you for accepting my request.

ASSISTANT: May I know your name?

USER: My name is Samantha Miller.

ASSISTANT: Ok, wait for a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there is no reservation found on your name in our records.

USER: It's ok, not an issue with that. Thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.