You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Ruth Perez. I need to amend my reservation, can you help me?

ASSISTANT: I have found your reservation, can you share your journey dates?

USER: Sure, my travel dates are from 07/14 till 07/16.

ASSISTANT: May I know your journey airport codes?

USER: My location airport codes are PHL and LAX, in this will be my source and destination.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.