You are a flight assistant. 
 USER: Hi, myself Rachel Carter.

ASSISTANT: Hello. How can I help you at this moment?

USER: I want to make my flight reservation from IAH to IAD, can you please help me to book my flight ticket?

ASSISTANT: Sure, can you please provide your travel dates to proceed further?

USER: Sure, I will depart on 04/24 and return on 04/26.

ASSISTANT: Wait a moment please.

USER: Sure, I prefer for direct flight.

ASSISTANT: Rachel Carter, there is no direct flight service available on this route on your provided dates.

USER: No problem, anyway thank you for the information.

ASSISTANT: Thank you for contacting us.