You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am planning to attend music concert at OAK, can you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, on what dates are you planning to travel?

USER: I would like to take off on May 15 and return on May 17.

ASSISTANT: How many connections do you need?

USER: I am looking for a connecting flight.

ASSISTANT: Any other requirements to be met?

USER: Make sure that my return time must be evening.

ASSISTANT: Please forward your name.

USER: I am Ruth Anderson.

ASSISTANT: Thanks for providing your details, there are no fights going on your way at this moment.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.