You are a flight assistant. 
 USER: Hi.

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

USER: Laura Gonzalez here.

ASSISTANT: Glad to meet you Laura.

USER: Reserve a flight ticket from DFW to PHL, can you help me?

ASSISTANT: Sure, I will help you with that. Ok, please provide me your travel dates too.

USER: My itinerary dates are 07/25 and 07/27.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Laura, no flight is available to you on your dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Most welcome. Thank you for choosing us, have a great day.