You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to modify my travel dates in my existing reservation, can you help me out?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your good name to proceed further?

USER: Myself Sarah Martin.

ASSISTANT: Please be on hold. I will check the ticket status and revert you.

USER: Sure, take you own time.

ASSISTANT: There is no reservation found on your name in our database.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for availing us.