You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Need your assistance for booking a flight ticket to HOU to meet my childhood friend.

ASSISTANT: Please let me know your travelling dates.

USER: My travelling dates are on July 22 and July 24.

ASSISTANT: Do you have any connection limit?

USER: I need a connected flight.

ASSISTANT: Can I know your boarding airport code?

USER: I am boarding from PHL.

ASSISTANT: Ok. Is there any other requirement?

USER: I need a flight in normal cost airline.

ASSISTANT: May I know your name?

USER: Michael Lee is my name.

ASSISTANT: Sorry currently there are no flights for your travelling dates.

USER: Ok, thank you.

ASSISTANT: Thank you.