You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: As I am a scientist, I want to attend science festival with my students at Washington. Can you do the reservation?

ASSISTANT: Sure, we are here to help you. Can you share me your source point and destination point?

USER: My airport codes are ORD-IAD.

ASSISTANT: Let me know when you are willing to travel?

USER: My trip dates are 05/24 and 05/26.

ASSISTANT: May I know your name?

USER: David Baker here.

ASSISTANT: Ok, wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for approaching us.