You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jeffrey Wilson.

ASSISTANT: How may I guide you today?

USER: Due to an emergency, I have to change my previous flight ticket booking with new travel dates. Can you please help me in flight ticket modification process?

ASSISTANT: Sure, I will help you with that.

USER: Thank you so much.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Sure, I can wait for your reply.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our database.

USER: Ok, that's fine. No issues with that one. Thank you for your help.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.

USER: Welcome.