You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to meet my grand parents at Boston, please help me in booking a ticket from DCA to BOS.

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My planned travel dates are on Nov 24 and Nov 26.

ASSISTANT: Please let me know if you have any class preference.

USER: I prefer business for my trip.

ASSISTANT:  Is there any other requirements for this trip to met with, so that I can find a suitable flight for your journey?

USER: I would like to return in the afternoon.

ASSISTANT:  To proceed further, can I have your name please?

USER: My name is Rachel Hill.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Welcome Rachel Hill.