You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to fly to Boston with the direct flight to treat an emergency case, can you please help me in booking?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: Sure, I need to start my journey on 02/19 and my return date will be on 02/21.

ASSISTANT: May I know your name?

USER: I am Pamela Wilson.

ASSISTANT: Please share me your airport codes.

USER: My boarding and landing airport codes are DFW and BOS.

ASSISTANT: Would you like to avail any benefits for the comfort of your journey?

USER: No more specifications for this trip.

ASSISTANT: Give me  a minute.

USER: Sure.

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

USER: That's ok, I'll choose any alternative. Thank you for your information.

ASSISTANT: Thank you for reaching us.