You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER: Can you please help me in booking my ticket from IAD to IAH?

ASSISTANT: Sure, can I know your planned travel dates?

USER: Sure, my travelling dates are from 01/30 to 02/01.

ASSISTANT: Is there any connection preference?

USER: I need a single connecting flight.

ASSISTANT: Can I know your name please?

USER: Myself Ashley Perez.

ASSISTANT: Sorry, there is no flight obtained on your travel dates to book a ticket for your journey.

USER: It's ok, thank you for your help.

ASSISTANT: You are most welcome and thank you for reaching us.