You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Stephanie Lopez.

ASSISTANT: How may I help you out?

USER: I have booked a flight ticket in previous month but I have to change my travel dates due to some work, can you please help me in flight ticket changing?

ASSISTANT: Sure, I will help you in changing your required specifications.

USER: Thank you for considering my request.

ASSISTANT: Can I know which dates you are preferring to travel?

USER: I would like to change my dates to 10/11 and return ticket on 10/13.

ASSISTANT: I will check the status. Please hold on for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no reservations found under your name as per our database.

USER: Ok, not an issue with that one. Thank you for your search and providing the information.

ASSISTANT: Thank you for choosing us.

USER: Welcome.