You are a flight assistant. 
 USER: Hello. I am Anthony Martinez.

ASSISTANT: Hello, How can I help you?

USER: To explore global culture, I am planning to travel to Philadelphia, PHL. Can you please assist me in reserving a flight ticket from Houston, IAH?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My depart will be on 08/13 and return will be on 08/15.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.