You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in  booking my flight ticket from PHL to HOU?

ASSISTANT: Sure, I am here to help you. May I know your travel dates?

USER: My trip dates will be Jan 30th to Feb 1st.

ASSISTANT: Noted. Please wait for a while, let me check for the available flights.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Helen Roberts.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Its ok, thank you.

ASSISTANT: You are most welcome.