You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Brian Hill want to visit IAH, can you help me to book a flight from DFW?

ASSISTANT: Sure, I am glad to assist you in flight ticket booking process and can you please let me provide your travelling dates?

USER: My travelling dates are Apr 07 and 09.

ASSISTANT: Do you need any particular class?

USER: No.

ASSISTANT: Thank you for your information, please be on hold for a moment to search for the flight and I will get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, non of the airlines is providing a flight for your location to book a ticket.

USER: No issues, thank you for your time.

ASSISTANT: You are most welcome and thank you for approaching our agency.