You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me to change the travel dates in the past ticket?

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

USER: Thank you for accepting my request.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: My name is Nancy Jackson.

ASSISTANT: Nancy Jackson, there is no active reservation found under your name in our database.

USER: It's ok, I think the ticket is not booked properly. Anyways thank you for your valuable time.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.