You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Walker.

ASSISTANT: How can I aid you?

USER: I would like to book a ticket from DFW to IAH, can you please help me out?

ASSISTANT: Sure, we are happy to help you. May I know your trip dates please?

USER: I am travelling on these dates OCT 14th and 16th.

ASSISTANT: Is there any connection limit for you?

USER: I need a direct flight.

ASSISTANT: Sorry no flight are available on your preferable dates of journey.

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

ASSISTANT: Thank you for choosing us.