You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am going to meet my childhood friend's at Phoenix this month. Can you please help me in reserving the ticket from IAD to PHX?

ASSISTANT: Please let me know your travelling dates?

USER: I am willing to take-off Mar 29, and again I will return back on Mar 31.

ASSISTANT: Do you need any connection limit?

USER: I am flexible with direct flight.

ASSISTANT: May I know your depart and arrival time?

USER: I am comfort with any time to depart and return.

ASSISTANT: Do you have any other specifications?

USER: My class preference is economy.

ASSISTANT: Can I know your name to reserve the ticket?

USER: Myself Nancy Edwards.

ASSISTANT: Sorry, there are no flights available on your routes.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.