You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Michael Brown here. I have to go Philadelphia for attending a business meeting there, can you please book a flight ticket for me on 11/28?

ASSISTANT: Sure Michel, I will help you out in booking.

USER: Thanks.

ASSISTANT: Can you please provide me your return date?

USER: I have meeting on 11/29 so please book my return ticket on 11/30.

ASSISTANT: Sure, may I know your airport codes?

USER: I want to departure on IAH and destination airport is PHL.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on your preferred dates.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you for choosing our services.