You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Jackson.

ASSISTANT: How can I assist you today?

USER: I would like to book a ticket to Houston, can you please help me out in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am travelling on these dates 12/02 and 12/04.

ASSISTANT: Please mention your airport codes that you want to travel.

USER: I am flying from PHL to IAH. Make sure connection limit is 0.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no flights found with connections 0.

USER: Ok no problem, thank you for your services.

ASSISTANT: My pleasure, have a great day.