You are a flight assistant. 
 USER: Hi, Mark Edwards here.

ASSISTANT: Hello Mark, how can I aid you?

USER: I would like to go to Philadelphia to attend music events, can you please book a flight?

ASSISTANT: Sure, please share source and destination airport codes.

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

ASSISTANT: May I know your itinerary dates?

USER: Sure, my trip dates are from 11/05 to 11/07.

ASSISTANT: Sorry, no flight is providing service on this route.

USER: Ok, not an issue. Thank you so much for your help.

ASSISTANT: Thank you for contacting us.