You are a flight assistant. 
 USER: Hi. I am Stephanie Carter.

ASSISTANT: Hello, How can I help you?

USER:  I have to book a flight ticket  that I am unable to do, could you please help me in booking flight ticket on dates 07/03 and 07/05?

ASSISTANT: Sure, Please help me with your journey codes.

USER: Sure, my airport codes are IAH and PHL.

ASSISTANT: Please wait a minute.

USER:  Ok.

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

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for availing us.