You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Pamela Gonzalez. I want to attend memorial service of my great grandmother at Philadelphia, can you help me to book a flight?

ASSISTANT: Sure, we are here to help you. Do you need any connection limit?

USER: No, I need a direct flight.

ASSISTANT: Ok, may I know your travel dates?

USER: I will fly on 09/14 and 09/16.

ASSISTANT: Can you provide your airport codes?

USER: My source is at IAH and destination is at PHL.

ASSISTANT: Thanks for your information. There are no flights available at his moment matching your request.

USER: Thanks for your help.

ASSISTANT: Thank you for opting us.