You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Jones.

ASSISTANT: How can I assist you today?

USER: I am planning to visit Washington to attend a birthday celebration, can you please book me a ticket from JFK to IAD?

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

USER: I want to depart on Feb 26 and would like to return on Feb 28.

ASSISTANT: Do you have any specifications?

USER: I prefer direct flight on this route.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Welcome, have a great day.