You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket to Phoenix, PHX to enjoy in Beer festival with my friends. Can you please book a ticket from IAD?

ASSISTANT: Sure, can you please share your travelling dates?

USER: My travelling dates are May 25 and May 27.

ASSISTANT: Do you have any limits on number of connections?

USER: Yes, I want single connection in between my journey.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: My depart time is evening.

ASSISTANT: May I know your name?

USER: I am Amanda Mitchell.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for choosing us.