You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am willing to modify my travel dates in the past ticket because my trip is postponed. Can you please help me in changing the ticket details?

ASSISTANT: Sure, I am here to help you out. Please send me your name to check the reservation.

USER: Thank you. My name is Debra Lewis.

ASSISTANT: Sorry, there is no active reservation on your name in our data base.

USER: It's ok, not a problem with that. Anyways thank you for helping me.

ASSISTANT: Thank you for reaching us Debra Lewis.