You are a flight assistant. 
 USER: Hello. I am Patricia Jones.

ASSISTANT: Hello, what sort of help are you seeking from me?

USER: I am planning to going for Navajo adventure at Houston, IAH. Please help me in booking a flight ticket from Philadelphia, PHL?

ASSISTANT: Sure, I am happy to help you. On which date you want to start from Philadelphia?

USER: I would like to start my journey on 05/15.

ASSISTANT: On which date you want to end?

USER: I want to catch my return flight on 05/17.

ASSISTANT: There is no flight with your respective dates of travel.

USER: That's not a problem. I will choose another alternative.

ASSISTANT: Thanks for opting us, hope to serve you better next time.

USER: Thanks for your information.